This program is by Torbjörn Wigren and is used here by permission.

This program is supplied without representation or warranty of any kind. Torbjörn Wigren and The Museum of HP Calculators therefore assume no responsibility and shall have no liability, consequential or otherwise, of any kind arising from the use of this program material or any part thereof.

The code was developed using HP-41CV, SERIAL NO. 2124S13142. It was independently tested using the HP-41 MCODE Emulator, Release 3. Files for this emulator are available for download at http://www.it.uu.se/katalog/tw/information .

This set of subroutines provides string functions for the HP 41C/CV. The functions "LEN", "RIGHT", "LEFT", "MID", "ADD", "ROL", "ROR", "FIND", "VAL", "NUM2STR", "STR2NUM", "STO", "RCL", "STOXYZT" and "RCLTZYX" are provided. The functions operate on strings in the alpha-register, according to arguments provided in the x- and y-registers. String results are returned in the alpha-register whereas numerical results are returned in the x-register of the stack. All functions allow string operations on strings with a maximum length of 6, 12, 18 or 24 characters, the choice being made by the user. All characters of the HP 41C/CV may be used. The characters of the strings are numbered from 1 and upwards, starting with 1 for the leftmost character. The extended functions module also contains a set of string functions that extends the string handling functionality of the HP 41C/CV calculator itself. However, users that do not have access to this module, are familiar with synthetic programming or own a HP 41CX are limited to the basic append, compare and shift functions that operate on strings in the HP 41C/CV. The intention has been to use basic programming techniques, to allow for easy adaptation of the code to specific applications. The provided string manipulating functionality is believed to be useful for a number of programming tasks, including encryption/decryption, password generation, logic simulation and the design of games.

"LEN"

The function returns the length (number of characters) of the string in the alpha-register, in the x-register. The string remains in the alpha-register after execution. In case the string in the alpha-register is longer than what can be stored according to the specified number of registers used for holding strings, the right part of the string is first truncated, after which the function is applied. If the stack needs to be preserved, "STOXYZT" / "RCLTZYX" can be applied.

Subroutines: "INIT" "RCL" (address 11) Stack: Used Data registers: 00 (length of string) 02 ("" - empty string) 03 (last set of 6 removed characters) 04 (" " - one space) Labels: 00 01 02 Flags 00 Arguments: alpha-register 0-24 characters

The algorithm operates by first applying ASHF to remove 6 characters at a time until the alpha-register is empty. The number of removed characters are increased by 6 for each shift. The last non-empty character string of the alpha-register is then restored to the alpha-register, after which one space is appended to this string. It is then checked if an ASHF leaves the alpha-register empty or not. If still empty, the value of the length counter is reduced by one and the space addition is repeated. The process terminates when the ASHF operation does no longer result in an empty alpha-register.

"RIGHT"

The function returns the right characters of the string stored in the alpha-register, from and including the character with the number stored in the x-register. The result is returned in the alpha-register, with the argument remaining in the x-register at end of execution. In case the string in the alpha-register is longer than what can be stored according to the specified number of registers used for holding strings, the right part of the string is first truncated, after which the function is applied. If the stack needs to be preserved, "STOXYZT" / "RCLTZYX" can be applied.

Subroutines: "INIT" "STO" (address 6) Stack: Used Data registers: 00 (counter) 01 (argument of x-register) 03 (number of characters (or blocks) to include in the result) 04 (" " - one space) 06 (part of result) 07 (part of result) 08 (part of result) 09 (part of result) Labels: 03 04 05 Arguments: alpha-register 0-24 characters x-register 1-25 (25 resulting in empty string)

The algorithm first removes blocks of 6 characters from the string in the alpha-register, decreasing the argument until it is less than 6. This is handled by register 03 that is initialized appropriately by "INIT". The remaining string is stored in registers 06 to 09, at label 04. The remaining characters to remove are processed at label 05. A string of spaces with a length such that the length plus the remaining characters to remove equals 6 is first created. The first 6 characters of the remaining string are then added to the sting of spaces and ASHF is applied. This removes the remaining characters. The rest of the blocks of characters of the result are finally retrieved from registers 07 to 09.

"LEFT"

The function returns the left characters of the string stored in the alpha-register, up to and including the character with the number stored in the x-register. The result is returned in the alpha-register, with the argument remaining in the x-register at end of execution. In case the string in the alpha-register is longer than what can be stored according to the specified number of registers used for holding strings, the right part of the string is first truncated, after which the function is applied. If the stack needs to be preserved, "STOXYZT" / "RCLTZYX" can be applied.

Subroutines: "INIT" "RCL" (address 6) Stack: Used Data registers: 00 (counter) 01 (argument of x-register) 03 (number of character blocks to remove) 04 (" " - one space) 05 (indirect storage address (6)) Labels: 06 07 08 09 10 16 Arguments: alpha-register 0-24 characters x-register 0-24 (0 resulting in empty string)

The algorithm first stores blocks of 6 characters in register 06 and on, decreasing the argument until it is less than 6. This is handled by register 03 that is initialized appropriately by "INIT", and by the indirect address stored in register 05. The number of remaining charcters to include in the result are then computed at label 07 from the updated indirect address of register 05. If the number of remaing characters equals 0 the algorithm proceeds to label 16 and terminates. Otherwise the last block of 6 characters (of which a subset is to be included in the result) is stored. The final step of the algorithm is to generate the string of the remaning characters to add from the last saved block. In order to do so, a string of spaces of length equal to 6 minus the number of characters to add is first constructed at label 8. The last block of 6 characters is appended to the constructed space string in the alpha-register. The first 6 characters are then stored. The remaining characters to add are now at the end of the stored result. At label 9 a new string of spaces is generated so that the TOTAL number of spaces in the generated strings of spaces equals 6. The string of length 6 with the characters to add at the end is appended to the alpha-register, rendering a string with 6 spaces at the beginning and the remaining characters to add at the end. Applying an ASHF operation removes the spaces, after which the final block of the result can be stored. Finally, at label 16, the result is appended in the alpha-register from the stored blocks of 6 characters, and the argument is restored to the x-register.

"MID"

The function returns the mid characters of the string stored in the alpha-register. The x-register specifies the right inclusive character number defining the extracted string, whereas the y-register specifies the left character number defining the extracted string. The result is returned in the alpha-register, with the arguments remaining in the x-register and the y-register at end of execution. In case the string in the alpha-register is longer than what can be stored according to the specified number of registers used for holding strings, the right part of the string is first truncated, after which the function is applied. If the stack needs to be preserved, "STOXYZT" / "RCLTZYX" can be applied.

Subroutines: "LEFT" (right argument) "RIGHT" (left argument). Stack: Used Data registers: 10 (left argument) 16 (right argument) Arguments: alpha-register 0-24 characters x-register 1-24 y-register 1-24

The function first extracts the left part, using "LEFT" and the desired right argument. Then the result is produced by execution of "RIGHT" with the desired left argument.

"ROL"

The function rotates the string of the alpha-register the number of steps left specified in the x-register. The x-register remains after execution. In case the string in the alpha-register is longer than what can be stored according to the specified number of registers used for holding strings, the right part of the string is first truncated, after which the function is applied. If the stack needs to be preserved, "STOXYZT" / "RCLTZYX" can be applied.

Subroutines: "STO" (address 21 - the string, address 34 - the result after "LEFT") "LEN" "LEFT" (minimum steps to rotate) "RCL" (address 21 - the string) "RIGHT" (argument to compute part of the string forming the leftmost part of the result) "ADD" (address 34) Stack: Used Data registers: 28 (argument) 29 (length of string) 30 (minimum steps to rotate - modulo applied) Arguments: alpha-register 1-24 characters x-register any integer (negative results in "ROR")

The function first stores the string at address 21 and computes its length with "LEN". The MOD operation avoids any need to rotate more than one complete revolution. The part to become the last part is first extracted by "LEFT" and stored at address 34. The stored complete string is restored to the alpha register and the part that is to form the first part of the result is extracted with "RIGHT". "ADD" applied to address 34 then forms the result.

"ROR"

The function rotates the string of the alpha-register the number of steps right specified in the x-register. The x-register remains after execution. In case the string in the alpha-register is longer than what can be stored according to the specified number of registers used for holding strings, the right part of the string is first truncated, after which the function is applied. If the stack needs to be preserved, "STOXYZT" / "RCLTZYX" can be applied.

Subroutines: "LEN" "ROL" (equivalent steps of left rotatation) Stack: Used Data registers: 29 (length of string) 31 (argument - steps to rotate right) Arguments: alpha-register 1-24 characters x-register any integer (negative results in "ROL")

The function computes the number of steps that would result in the same result by a left rotation, then applies "ROL".

"ADD"

The function augments the string with the address provided in the x-register, to the string in the alpha-register. The use of indirect addressing ensures that all registers can be used for storage of strings. The argument remains in the x-register at end of execution. If the stack needs to be preserved, "STOXYZT" / "RCLTZYX" can be applied.

Note: No truncation of the right part of the string in the alpha-register is applied.

Stack: Used Data registers: 00 (string block counter) 03 (argument plus number of registers per string) 10 (argument - string address) 15 (number of registers per string (1,2,3 or 4)) Labels: 17 Arguments: alpha-register 0-24 characters x-register any valid register address

The function adds each register of the string by indirect addressing.

"FIND"

The function returns the (2-digit) positions of an up to 6 character string, stored at the address specified in the x-register, in the string of the alpha register. The string in the alpha register remains after execution and the result is presented in the x-register. In case the string in the alpha-register is longer than what can be stored according to the specified number of registers used for holding strings, the right part of the string is first truncated, after which the function is applied. If the stack needs to be preserved, "STOXYZT" / "RCLTZYX" can be applied.

Subroutines: "STO" (address 21 - string to search) "LEN" "RCL" (address 21) "MID" (arguments to extract a piece of the searched string, the piece having the length of the search string) Stack: Used Data registers: 17 (argument - address of 6 character string) 18 (length of searched string) 19 (length of search string minus 1) 20 (pointer to the currently investigated position) 27 (multiplier to encode 2 digit positions as an integer) 28 (result) Labels: 34 35 Arguments: alpha-register 1-24 characters x-register any valid register address, reg x (the string searched for) 1-6 characters

The function first stores the original string and computes its length. The function also computes the length of the string searched for. Then all possible positions of the string searched for, in the searched string, are extracted from the searched string by "MID". It is then tested whether the extracted part is the same as the string searched for. If so, the position (leftmost character) is encoded as a two bit number in the integer result.

"VAL"

The function transforms a string in the alpha-register consisting of the characters 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9, to the corresponding numerical nonnegative integer value. The result is displayed in the x-register and the string remains in the alpha-register after execution. In case the string in the alpha-register is longer than what can be stored according to the specified number of registers used for holding strings, the right part of the string is first truncated, after which the function is applied. If the stack needs to be preserved, "STOXYZT" / "RCLTZYX" can be applied. Note that the execution time is significantly higher than for the character manipulating string functions.

Subroutines: "LEN (string in alpha register)" "STO" (address 21) "MID" (current character pointer) "RCL" (address 21) Stack: Used Data registers: 05 (indirect address (character)) 17 (current character pointer) 18 (result) 19 (void) 20 (number multiplier) Labels: 13 14 15 "1" "2" "3" "4" "5" "6" "7" "8" "9" "0" Arguments: alpha-register 1-24 characters

The algorithm first calls "LEN" to compute the length of the character string, in order to set up loops. The provided string is also stored, starting at register 21. "MID" is then used to extract each character, starting at the right. For each character, the value of register 20 is multiplied by 10, thereby allowing the contribution of each character to be added to the result after multiplication with register 20 of the number obtained by transforming the character to a numerical value. This transformation is performed by an indirect addressing, using the extracted character as the address to one of the charactre labels "0" to "9".

"NUM2STR"

The function transforms any numerical value of the x-register to a string in the alpha register. All formats are covered.

Data register: 00 (numerical value)

"STR2NUM"

The function transforms a string corresponding to a floating point numerical value, to the numerical value. The string remains in the alpha-register after execution and the result appears in the x-register.The functions handles FIX, SCI and ENG formats, however there must only be ONE SEPARATOR. This must be the COMMA that separates the integer and fractional parts of the mantissa. If the stack needs to be preserved, "STOXYZT" / "RCLTZYX" can be applied. Note that the execution time is significantly higher than for the character manipulating string functions. Note also that the number of registers used for string storage (register 15) needs to be set to 3 or 4.

Subroutines: "STO" (address 34) "RCL" (address 34) "LEN" (to combine mantissa) "LEFT" (argument 1 (sign)) "MID" (argument counter, argument to retrieve fractional and integer parts of mantissa) "RIGHT" (argument to retrieve exponent) "VAL" (transforms nonnegative part of exponent, fractional and integer parts of mantissa, to numerical values) Stack: Used Data registers: 27 (length of string) 28 (sign of mantissa) 29 (integre part of mantissa,mantissa and result) 30 (sign of exponent, 10^(exponent * sign of exponent)) 31 (position of ",") 32(position of "E") 33 (counter) 38 ("-") 39 (",") 40 ("E") 41 (currently processed character) Labels: 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 Arguments: alpha-register 1-24 characters representing a valid floating point number

The function first initializes necessary registers for storage of the different parts of the floating point number. It also stores the string at string address 34. It then uses character manipulating string functions to find the sign of the exponent (if any), the sign of the mantissa, the position of the separator (if any) between the integer and fractional parts of the mantissa, the position of the exponent (if any), represented by the character E. Given this information, the three strings corresponding to the nonnegative integer part of the mantissa, the nonnegative fractional part of the mantissa (if any) and the nonnegative integer part of the exponent can all be extracted from the original string, again using character manipulating string functions. The results are then converted to numerical values using "VAL". From this it is straightforward to build up the umerical result.

The function stores the string in the alpha-register indirectly in the registers starting with the address provided in the x-register. The indirect addressing secures that all registers can be used for storage of strings. The string remains in the alpha-register after execution. In case the string in the alpha-register is longer than what can be stored according to the specified number of registers used for holding strings, the right part of the string is first truncated, after which the function is applied. If the stack needs to be preserved, "STOXYZT" / "RCLTZYX" can be applied.

Subroutines: "RCL" (argument of x-register) Stack: Used Data registers: 15 (number of registers per string, 1,2,3 or 4) 25 (running register address) 26 (string address plus number of registers) Labels: 11 Arguments: alpha-register 0-24 characters x-register any valid register address

The function applies indirect addressing to store a string starting in the register specified in the x-register. The number of registers used for storage equals the number spcified in register 15. Six characters are stored in each register.

"RCL"

The function recalls the string specified with the address provided in the x-register. The string is recalled to the alpha-register. The indirect addressing applied secures that all registers can be used for storage of strings. The argument remains in the x-register after execution. If the stack needs to be preserved, "STOXYZT" / "RCLTZYX" can be applied.

Stack: Used Data registers: 15 (number of registers per string, 1,2,3 or 4) 25 (running register address) 26 (string address plus number of registers) Labels: 12 Arguments: x-register any valid register address

The function applies indirect addressing to recall a string starting in the register specified in the x-register. The number of registers used for recalling equals the number spcified in register 15. Six characters are recalled from each register.

"STOXYZT"

This function stores the stack. To be applied before string function calls whenever the stack should be preserved.

Data registers: 42 (x-register) 43 (y-register) 44 (z-register) 45 (t-register)

"RCLTZYX"

This function restores the stack, as saved by "STOXYZT". To be applied after string function calls whenever the stack should be preserved.

Data registers: 42 (x-register) 43 (y-register) 44 (z-register) 45 (t-register)

"INIT"

The function performs common initial storing of the string in the alpha-register and any argument of the x-register. The subroutine also sets up common register values needed for string manipulation.

Subroutines: "STO" (address 11) "RCL" (address 11) Stack: Used Data registers: 00 (argument of x-register) 01 (argument of x-register) 02 ("" - empty string) 03 (integer part of (argument in x-register)/6) 04 (" " - one space) 05 (indirect storage address (6)) 06 ("" - empty string) 07 ("" - empty string) 08 ("" - empty string) 09 ("" - empty string) Flags: 00

"LEN", "RIGHT", "LEFT", "ADD", "STO", "RCL", ("INIT").

These functions need no other supporting functions for their execution. The following resources are consumed by this minimum set.

Data register used: <=26. Labels used: <=17. Flags used: Flag 0.

Remaining functions can be added to this set as desired. In case of addition of VAL the limits on data registers and labels above still holds, otherwise please consult the description above. In case a known or fixed length is used, then LEN may be omitted by replacements in the code. When the complete set of functions is used, the following limits apply:

Data registers used: <=45. Labels used: <= 35. Flags used: Flag 0.

The complete set of functions consume 185 data registers for the code.

In case other combinations of string functions are used the user is referred to the documentation of each function for information of which subroutines, data registers and labels that are used. The minimum set of functions do not need additional support. However, when other functions are added this may not apply. "STR2NUM" e.g. makes use of "VAL". The user is referred to the documentation of each function for details.

3 data registers per string is to be used. 3 STO 15 Also store an empty space in data register 53. " " ASTO 53 Store a string in the alpha-register. "HP-41CV CALCULATOR" Then store it, starting at data register 50. 50 XEQ "STO" The numerical display and the alpha-register remain unaffected. "HP-41C" is now stored in data register 50, "V CALC" in data register 51 and "ULATOR" in data register 52. Compute the length of the string in the alpha-register. XEQ "LEN" The numerical display shows the result 18. The alpha-register remains unaffected. Find the location of the space in the string. 53 XEQ "FIND" The numerical display shows the result 8. Extract the first word of the string in the alpha-register. 7 XEQ "LEFT" The numerical display is unaffected. The alpha-register shows the result "HP-41CV". Store the result, starting at register 54. 54 XEQ "STO" "HP-41C" is now stored in register 54, "V" in data register 55 and "" in data register 56. Extract the fourth and fifth characters of the string in the alpha-register. 4 ENTER 5 XEQ "MID" The x- and y-registers remain unaffected. The alpha-register shows the result "41". Transform the result to a numerical value. XEQ "VAL" The alpha-register remains unaffected. The numerical dispaly shows the numerical value 41. Recall the original string and rotate left 7 steps. 50 XEQ "RCL" 7 XEQ "ROL" The numerical display remains unaffected. The alpha-register displays the result " CALCULATORHP-41CV". Recover the original string. 7 XEQ "ROR" The numerical display remains unaffected. The alpha-register shows the result "HP-41CV CALCULATOR". Then find the location of the letter "C" in the string of the alpha-register. First store "C" in data register 60. "C" ASTO 60 "C" is now stored in alpha-register and in data register 60. Recall the original string starting in data register 50, and search for "C". 50 XEQ "RCL" 60 XEQ "FIND" The display shows 120906, i.e positions 12, 09 and 06. The alpha-register is unaffected. Extract the second word of the string and add the string stored at data register 54. Also compute the length of the result. 9 XEQ "RIGHT" 54 XEQ "ADD" XEQ "LEN" The numerical display shows the length 17. The alpha-register shows the result "CALCULATORHP-41CV". This is because the space is now gone. Then set the calculator in scientific mode with 4 decimals. Key in -34.56e-78. SCI 4 -34.56 EEX -78 ENTER The numerical display shows -3,4560 -77. Then transform to a string and clear the display. XEQ "NUM2STR" CLX The alpha-register displays the string -3,4560E-77. The numerical display shows 0. Finally, restore the numerical value. XEQ "STR2NUM" The numerical display shows the result -3,4560 -77. The alpha-register remains unaffected.

001 LBL "LEN" 002 XEQ "INIT" 003 0 004 STO 00 005 LBL 00 006 ASTO 03 007 ASHF 008 ASTO X 009 RCL 02 010 X=Y? 011 SF 00 012 6 013 ST+ 00 014 FC?C 00 015 GTO 00 016 LBL 01 017 ARCL 03 018 ARCL 04 019 ASTO 03 020 ASHF 021 ASTO X 022 RCL 02 023 X#Y? 024 GTO 02 025 1 026 ST- 00 027 GTO 01 028 LBL 02 029 11 030 XEQ "RCL" 031 RCL 00 032 RTN 033 LBL "RIGHT" 034 XEQ "INIT" 035 1 036 ST- 00 037 RCL 00 038 6 039 / 040 INT 041 STO 03 042 LBL 03 043 RCL 03 044 X=0? 045 GTO 04 046 ASHF 047 6 048 ST- 00 049 1 050 ST- 03 051 GTO 03 052 LBL 04 053 6 054 XEQ "STO" 055 CLA 056 LBL 05 057 ARCL 04 058 1 059 ST+ 00 060 RCL 00 061 6 062 x#Y? 063 GTO 05 064 ARCL 06 065 ASHF 066 ARCL 07 067 ARCL 08 068 ARCL 09 069 RCL 01 070 RTN 071 LBL "LEFT" 072 XEQ "INIT" 073 X=0? 074 GTO 07 075 LBL 06 076 ASTO IND 05 077 ASHF 078 1 079 ST- 03 080 ST+ 05 081 RCL 03 082 X#0? 083 GTO 06 084 LBL 07 085 RCL 05 086 6 087 - 088 6 089 * 090 ST- 00 091 RCL 00 092 X=0? 093 GTO 16 094 STO 03 095 ASTO IND 05 096 CLA 097 LBL 08 098 ARCL 04 099 1 100 ST+ 03 101 RCL 03 102 6 103 X#Y? 104 GTO 08 105 ARCL IND 05 106 ASTO IND 05 107 CLA 108 LBL 09 109 ARCL 04 110 1 111 ST- 00 112 RCL 00 113 X#0? 114 GTO 09 115 LBL 10 116 ARCL IND 05 117 ASHF 118 ASTO IND 05 119 LBL 16 120 6 121 XEQ "RCL" 122 RCL 01 123 RTN 124 LBL "MID" 125 STO 16 126 X<>Y 127 STO 10 128 X<>Y 129 XEQ "LEFT" 130 RCL 10 131 XEQ "RIGHT" 132 RCL 16 133 RTN 134 LBL "INIT" 135 STO 00 136 STO 01 137 6 138 STO 05 139 / 140 INT 141 STO 03 142 CF 00 143 11 144 XEQ "STO" 145 CLA 146 ASTO 02 147 ASTO 06 148 ASTO 07 149 ASTO 08 150 ASTO 09 151 " " - One space 152 ASTO 04 153 11 154 XEQ "RCL" 155 RCL 03 156 RTN 157 LBL "STO" 158 STO 25 159 STO 26 160 RCL 15 161 ST+ 26 162 LBL 11 163 ASTO IND 25 164 ASHF 165 1 166 ST+ 25 167 RCL 25 168 RCL 26 169 X>Y? 170 GTO 11 171 RCL 15 172 ST- 26 173 RCL 26 174 XEQ "RCL" 175 RTN 176 LBL "RCL" 177 CLA 178 STO 25 179 STO 26 180 RCL 15 181 ST+ 26 182 LBL 12 183 ARCL IND 25 184 1 185 ST+ 25 186 RCL 25 187 RCL 26 188 X>Y? 189 GTO 12 190 RCL 26 191 RCL 15 192 - 193 RTN 194 LBL "VAL" 195 XEQ "LEN" 196 STO 17 197 0 198 STO 18 199 STO 19 200 1 201 STO 20 202 21 203 XEQ "STO" 204 LBL 13 205 RCL 17 206 ENTER^ 207 XEQ "MID" 208 ASTO 05 209 21 210 XEQ "RCL" 211 RCL 20 212 GTO IND 05 213 LBL 14 214 ST+ 18 215 10 216 ST* 20 217 1 218 ST- 17 219 RCL 17 220 X>0? 221 GTO 13 222 RCL 18 223 RTN 224 LBL "1" 225 1 226 GTO 15 227 LBL "2" 228 2 229 GTO 15 230 LBL "3" 231 3 232 GTO 15 233 LBL "4" 234 4 235 GTO 15 236 LBL "5" 237 5 238 GTO 15 239 LBL "6" 240 6 241 GTO 15 242 LBL "7" 243 7 244 GTO 15 245 LBL "8" 246 8 247 GTO 15 248 LBL "9" 249 9 250 GTO 15 251 LBL "0" 252 0 253 LBL 15 254 * 255 GTO 14 256 LBL "ADD" 257 STO 10 258 STO 00 259 STO 03 260 RCL 15 261 ST+ 03 262 LBL 17 263 ARCL IND 00 264 1 265 ST+ 00 266 RCL 00 267 RCL 03 268 X>Y? 269 GTO 17 270 RCL 10 271 RTN 272 LBL "NUM2STR" 273 STO 00 274 CLA 275 ARCL 00 276 RTN 277 LBL "STR2NUM" 278 0 279 STO 29 280 STO 30 281 STO 31 282 STO 32 283 34 284 XEQ "STO" 285 CLA 286 "-" 287 ASTO 38 288 CLA 289 "," - Assumes that , is the divider. 290 ASTO 39 291 CLA 292 "E" 293 ASTO 40 294 34 295 XEQ "RCL" 296 XEQ "LEN" 297 STO 27 298 1 299 XEQ "LEFT" 300 ASTO X 301 RCL 38 302 X=Y? 303 GTO 18 304 1 305 GTO 19 306 LBL 18 307 -1 308 LBL 19 309 STO 28 310 X<0? 311 GTO 20 312 1 313 STO 33 314 GTO 21 315 LBL 20 316 2 317 STO 33 318 LBL 21 319 34 320 XEQ "RCL" 321 RCL 33 322 ENTER^ 323 XEQ "MID" 324 ASTO 41 325 ASTO X 326 RCL 39 327 X#Y? 328 GTO 22 329 RCL 33 330 STO 31 331 LBL 22 332 CLA 333 ARCL 41 334 ASTO X 335 RCL 40 336 X#Y? 337 GTO 23 338 RCL 33 339 STO 32 340 LBL 23 341 CLA 342 ARCL 41 343 ASTO X 344 RCL 38 345 X#Y? 346 GTO 24 347 -1 348 STO 30 349 LBL 24 350 1 351 ST+ 33 352 RCL 27 353 RCL 33 354 X<=Y? 355 GTO 21 356 34 357 XEQ "RCL" 358 RCL 32 359 X=0? 360 GTO 25 361 RCL 30 362 X=0? 363 GTO 26 364 RCL 32 365 2 366 + 367 GTO 27 368 LBL 26 369 1 370 STO 30 371 RCL 32 372 1 373 + 374 LBL 27 375 XEQ "RIGHT" 376 XEQ "VAL" 377 RCL 30 378 * 379 10^X 380 STO 30 381 34 382 XEQ "RCL" 383 LBL 25 384 RCL 32 385 X#0? 386 GTO 28 387 1 388 STO 30 389 RCL 27 390 1 391 + 392 STO 32 393 LBL 28 394 RCL 31 395 X=0? 396 GTO 29 397 1 398 + 399 RCL 32 400 1 401 - 402 XEQ "MID" 403 XEQ "VAL" 404 STO 29 405 XEQ "LEN" 406 10^X 407 ST/ 29 408 LBL 29 409 34 410 XEQ "RCL" 411 RCL 31 412 X=0? 413 GTO 30 414 1 415 - 416 GTO 31 417 LBL 30 418 RCL 32 419 1 420 - 421 LBL 31 422 RCL 28 423 X>0? 424 GTO 32 425 RDN 426 2 427 GTO 33 428 LBL 32 429 RDN 430 1 431 LBL 33 432 X<>Y 433 XEQ "MID" 434 XEQ "VAL" 435 ST+ 29 436 RCL 28 437 ST* 29 438 RCL 30 439 ST* 29 440 34 441 XEQ "RCL" 442 RCL 29 443 RTN 444 LBL "STOXYZT" 445 STO 42 446 RDN 447 STO 43 448 RDN 449 STO 44 450 RDN 451 STO 45 452 RDN 453 RTN 454 LBL "RCLTZYX" 455 RCL 45 456 RCL 44 457 RCL 43 458 RCL 42 459 RTN 460 LBL "ROL" 461 STO 28 462 21 463 XEQ "STO" 464 XEQ "LEN" 465 STO 29 466 RCL 28 467 X<>Y 468 MOD 469 STO 30 470 XEQ "LEFT" 471 34 472 XEQ "STO" 473 21 474 XEQ "RCL" 475 RCL 30 476 1 477 + 478 XEQ "RIGHT" 479 34 480 XEQ "ADD" 481 RCL 28 482 RTN 483 LBL "ROR" 484 STO 31 485 XEQ "LEN" 486 STO 29 487 RCL 31 488 X<>Y 489 MOD 490 CHS 491 RCL 29 492 + 493 XEQ "ROL" 494 RCL 31 495 RTN 496 LBL "FIND" 497 STO 17 498 21 499 XEQ "STO" 500 XEQ "RCL" 501 XEQ "LEN" 502 STO 18 503 CLA 504 ARCL IND 17 505 XEQ "LEN" 506 1 507 - 508 STO 19 509 1 510 STO 20 511 0 512 STO 27 513 STO 28 514 LBL 34 515 21 516 XEQ "RCL" 517 RCL 20 518 RCL 20 519 RCL 19 520 + 521 XEQ "MID" 522 ASTO X 523 RCL IND 17 524 X#Y? 525 GTO 35 526 RCL 27 527 10^X 528 RCL 20 529 * 530 ST+ 28 531 2 532 ST+ 27 533 LBL 35 534 1 535 ST+ 20 536 RCL 18 537 RCL 19 538 - 539 RCL 20 540 X<=Y? 541 GTO 34 542 21 543 XEQ "RCL" 544 RCL 28 545 RTN 546 END

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