HP42s – Solver / Variable Menu compatibility.

[Dave Britten]

This seems to work, at least according to Free42.

Code:

LBL "VOL"
MVAR "L"
MVAR "W"
MVAR "H"
MVAR "V"
RCL "L"
RCL* "W"
RCL* "H"
RCL- "V"
END

LBL "BOXSLV"
MVAR "L"
VARMENU "BOXSLV"
STOP
PGMSLV "VOL"
RCL "L"
3
*
STO "H"
3
*
STO "V"
SOLVE "W"
END

XEQ "BOXSLV", supply a value for L using the menu, and press R/S.