Step-by-step programs in CAS

[compsystems]

Thanks Han, (Updated above code), The problem was that when porting a code from ti68k, which uses the character #173 (-) as a change of sign, That is not the change of sign in the hp-prime

PHP Code:

// ti68k
inequali()
Prgm
 Local expr0
 ClrIO
 Disp "step1: "
 3*x^2-2*x-2 < 2*x^2-3*x+4 → expr0
 Disp expr0

 Disp "step2: +(-­2*x^2)"
 expr0 + ­2*x^2 → expr0
 Disp expr0

 Disp "step3: +3*x"
 expr0 + 3*x → expr0
 Disp expr0

 Disp "step4: +(-­4)": Pause
 expr0 + -­4 → expr0
 Disp expr0
EndPrgm