#include <iostream.h>
#include <conio.h>

int ReadNumber(int x,int y)
{
int z;
z = x + y;
return z;
}

void WriteAnswer(int x)
{
cout << "\n The Answer is " << x;
}

void main()
{
int x,y,z;
clrscr();
cout << "\n Enter the first Number : ";
cin >> x;
cout << " \n Enter the second Number : ";
cin >> y;
z = ReadNumber(x,y);
WriteAnswer(z);
getch();
}

/*End of Program */

#ifdef IO_H should be @define IO_H

Silly me.

This is my main ccp (test8.cpp):

// Test8.cpp : Defines the entry point for the console application.

#include "stdafx.h"
#include "io.h"

int main()
{
	int x = ReadNumber();
	int y = ReadNumber();
	WriteAnswer(x+y);
	return 0;
}

This is my io.cpp:

#include "stdafx.h"
#include 

int ReadNumber()
{

	using namespace std;
	cout <> x;
	return x;
}

void WriteAnswer(int x)
{
	using namespace std;
	cout << "The answer is: " << x << endl;
}

And this is my io.h:

#ifndef IO_H
#ifdef IO_H

int ReadNumber();
void WriteAnswer(int x);

#endif

This is the error I get:

c:vcpp2008projectstest8test8io.h(8) : fatal error C1070: mismatched #if/#endif pair in file ‘c:vcpp2008projectstest8test8io.h’

(I’m putting #include iostream with at each side or iostream at the top of io.cpp here and there isn’t supposed to be space between the << after the cout in io.cpp here either, but it won’t display correctly. Slashes won’t show up in the error message either.)