C / C++ / MFC

wofstream outputFile( "test.txt" ) ;
outputFile << L"fsck!" << endl ;

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

using namespace std;


int sum = 0;
int ssum = 0;
int msum = 0;
double dsum = 0;
int x = 0;
int y = 0;
int menu();
int c = menu();

int main()
{	
	do
	{
		int menu();

		if(c == 1)
		   int add();
		else if(c == 2)	
	       	   int sub();
		else if(c == 3)
		   int multi();
		else if(c == 4)
		   double div();
	}

	getch();
	return 0;
}
		 
int menu()
{	
	int sel = 0;

    cout<<"Please select a menu choice..."<<endl
    <<"1. Add"<<endl
    <<"2. Subtract"<<endl
    <<"3. Multiply"<<endl
    <<"4. Divide"<<endl
    <<"5. Exit program"<<endl;
		cin>>sel;
		
	if(c = 5)
	    cout<<"Thank you for using the calculator!"<<endl;
	else if(c > 5 && c < 1)
	    cout<<"You have entered an invalid selection!"<<endl;

	return sel;
}

int add()
{
        cout<<"Please enter a number..."<<endl;
		cin>> x;
	cout<<"Please enter your second number..."<<endl;
		cin>>y;

	sum = x + y;
	cout<<"The answer is "<<sum<<endl;

	    return sum;
}

int sub()
{
        cout<<"Please enter a number..."<<endl;
		cin>> x;
	cout<<"Please enter your second number..."<<endl;
		cin>>y;
	
	ssum = x - y;
	cout<<"The answer is "<<ssum<<endl;

	    return ssum;
}

int multi()
{
	cout<<"Please enter a number..."<<endl;
		cin>> x;
	cout<<"Please enter your second number..."<<endl;
		cin>>y;
	
	msum = x * y;
	cout<<"The answer is "<<msum<<endl;

		return msum;
}

double div()
{
	cout<<"Please enter a number..."<<endl;
		cin>> x;
	cout<<"Please enter your second number..."<<endl;
		cin>>y;
	
	dsum = x / y;
	cout<<"The answer is "<<dsum<<endl;

		return dsum;
}