[SOLVED] Caling procedure in conversion.asm from main .asm

Caling procedure in conversion.asm from main .asm

I have two asm files, one is conversion.asm and one is main.asm, I am using conversion.asm in main.asm. I am using floating point stack but I am not getting the right output.

main.asm

Include conversion.asm

.386
.stack 4096

ExitProcess PROTO, dwExitCode:DWORD

.data
Cel DD 25
Faren DD ?

.code
main PROC
  push dword ptr Cel
  fld dword ptr [esp]

  call C2F

  fstp dword ptr [Faren]
  mov ebx, [Faren]
  INVOKE ExitProcess, ebx
main ENDP
END main

conversion.asm


.model flat, stdcall

ExitProcess PROTO, dwExitCode:DWORD
.stack 4096

.data 
Cfirst DD 2
Csecond DD 1
common DD 32

C2F PROC
    push dword ptr Cfirst
    fld dword ptr [esp]
    add esp,4
    fmulp
    sub esp,4
    push dword ptr Csecond
    fld dword ptr [esp]
    add esp,4
    fdivp
    sub esp,4
    push dword ptr common
    fld dword ptr [esp]
    add esp,4
    faddp
    sub esp,4
    RET
C2F ENDP

Please help me out

Solution

fmul, fdiv, fadd edit data in floating stack directly, so instead of pulling from stack to register, do operation directly in floating stack.

Correct usage of floating point stack in conversion.asm:

.DATA
five DWORD 5.0
nine DWORD 9.0
ttw DWORD 32.0

.CODE
C2F proc
    fmul nine
    fdiv five
    fadd ttw
    ret
C2F ENDP

For reading float and writing float I used Irvine library, which uses floating point stack:

Include Irvine32.inc
Include conversion.asm

.data
Celprompt BYTE "Enter a value in C:",0
Cel DWORD 0
Resprompt BYTE "In Farenheit that value is - "
Faren DD ?

.code
main PROC
  mov edx, OFFSET Celprompt
  call WriteString
  call Crlf
  call ReadFloat
  call C2F
  call Crlf
  mov edx, OFFSET Resprompt
  call WriteString
  call WriteFloat
main ENDP
END main