In C. How to retrieve RETURN values from assembly functions? I always got 0

[luisvalencia]

Hello. I have a simply programs that sums two numbers in assembler. I also have a c program with a .h file that must use that program.

But I always got as a result a 0.

This is my asm code

Code:

MyProc proc var1:REAL4, var2:REAL4
    LOCAL retval:REAL4
    PUBLIC MyProc
    finit
    fld var1
    fld var2
    fadd
    fstp retval
    fwait                ;<- is this really needed?
    mov eax, retval
    ret
MyProc endp

This is my .h code

Code:

#ifndef _FLOTANTE_H
#define _FLOTANTE_H

extern "C" unsigned long __stdcall __MyProc(float, float);

float MyProc(float f1, float f2);


#endif

and this is my C code


Code:

void sum(void)
{
     int ch;
     float f1;
     float f2;
     printf("Enter first number\n\n");
	scanf("%d",&f1);
	printf("Enter second  number\n\n");
	scanf("%d",&f2);
     
     float total2;
     total2 = MyProc(f1, f2);
     printf("Total is: %d", total2);

	while ( (ch = getchar()) != '\n' && ch != EOF) ;

	printf("\n\nPress ENTER to continue.");
	while ( (ch = getchar()) != '\n' && ch != EOF)
;
   if(ch=='\n' || ch==EOF)
   {
      printmenu();           
   }
   
}

[misplaced]

maybe using the same data types would help........

what was your input?

[luisvalencia]

3 and 2 for example