commands to change settings modes for HOME and CAS but by software?

[compsystems]

Which are the commands to change modes?, for example exact mode to approximate mode and viceversa, and simplifications, none, maximun, and others of HOME-CAS settings etc

I found some to change angle and other settings?

Code:

    export getMode_angle()
    begin
        if AAngle == 1 then
            return( "RADIAN" );
        else
            if AAngle == 2 then
                return( "DEG" );
            else 
              return( "SYS_ANGLE" );
            end;
        end;
    end;
    
    export setMode_angle( angle_mode )
    begin
        if angle_mode == "RADIAN" then
            AAngle := 1
        else
            if angle_mode == "DEG" then
                AAngle := 2
            else 
              AAngle := 0
            end;
        end;
    end;

I am creating a library for configuring modem by strings, which is much more intuitive than by numbers.

if getMode_angle() == "RADIAN" then
...
else
...
end;


setMode_angle( "RADIAN" );

setMode_angle( "DEG" );

Thanks for your reply