Thread: Calling Assembly Language programs from C++ program

Okay, for a lab assignment, I need to construct a C++ program that will call an Assembly Language procedure. The provided code is not what I am going to turn in. It is just a dummy program which is to help me get a better understanding on how to do it. Unfortunately, I cannot get the C++ program to call the assembly language program. It assembles and builds fine, but it just does not call the ASM program. I was wondering if anyone here could help me out?

Here is the header file (called Solution.h):

Code:

//
//

extern "C"
{
	int AsmTest(float* a, float* b, float* c);
}

Here is the ASM code (called AsmTest):

Code:

TITLE 

; Author: 
; Class: 
; Date: 
; 

.586
.model flat,C

AsmTest PROTO,
	aVal:PTR REAL8, bVal:PTR REAL8, cVal:PTR REAL8

.data

	value REAL8 3.5

	answer INT 1

.code

AsmTest PROC,
	aVal:PTR REAL8, bVal:PTR REAL8, cVal:PTR REAL8

	FINIT

	FLD aVal

	FMUL bVal

	FSTP aVal

	FLD value

	FSTP cVal

	int 3

	mov EAX, answer

	ret

AsmTest ENDP

;------------------------------------------------------------------------------

END

Here is the main procedure:

Code:

//
//

#include <iostream>
#include "Solution.h"

using namespace std;

int main()
{
	float a;

	float b;

	float c;

	int x;

	cout << "Enter the first decimal number (if it does not have a decimal number," << '\n'
		 << "then put a .0 at the end of the number): ";

	cin >> a;

	cout << "Enter the second decimal number (if it does not have a decimal number," << '\n'
		 << "then put a .0 at the end of the number): ";

	cin >> b;

	cout << "Enter the third decimal number (if it does not have a decimal number," << '\n'
		 << "then put a .0 at the end of the number): ";

	cin >> c;

	float* a2 = &a;

	float* b2 = &b;

	float* c2 = &c;

	x = AsmTest(a2, b2, c2);

	cout << a << '\n' << b << '\n' << c << '\n' << x << endl;

	system("Pause");

	return 0;

}

Just FYI, I made these using Microsoft Visual Studio 2010, and I placed the ASM file in the Source Files of the Visual Studio Solution Explorer.

Oh, and the "int 3" that appears in the ASM code is just so that the debugger would activate since there was a problem with the return value (but that is useless if I can't get the C++ code to call the ASM code).

I am not getting any error messages from this. As I said, it compiles, builds, and executes fine. It just does not call the AsmTest function.

They should be for floats.