Code:

#include <iostream>
using namespace std;
int main ()
{
int a;
cout << "Welcome to OSCaP. The Open Source Calculator Project.";
cout << endl;
cout << "What would you like to do today?";
cout << endl;
cout << "1. Add";
cout << endl;
cout << "2. Multiply";
cout << endl;
cout << "3. Subtract";
cout << endl;
cout << "4. Divide";
cout << endl;
cout << ">";
cin >> a;
if (a == 1)
{
int b, c;
char z;
cout << "What is the number that you would like to add to the second?";
cout << endl;
cin >> b;
cout << "What is the number that you would like to add to the first?"\a;
cout << endl;
cin >> c;
cout << b + c;
cout << endl;
cout << "Would you like to continue?
}
else if (a == 2)
{
int d, e;
char x;
cout << "What is the number that you would like to multiply by the second?";
cout << endl;
cin >> d;
cout << "What is the number that you would like to multiply the first number by?";
cout << endl;
cin >> e;
cout << d * e;
cout << endl;
}
else if (a == 3)
{
int f, g;
char y;
cout << "What is the number that you would like to subtract by the second?";
cout << endl;
cin >> f;
cout << "What is the number that you would like to subtract eh first by?";
cout << endl;
cin >> g;
cout << f - g;
cout << endl;
}
else if (a == 4)
{
int h, i;
char u;
cout << "What is the number that you would like to divide by the second?";
cout << endl;
cin >> h;
cout << "What is the number that you would like to divide the first number by";
cout << endl;
cin >> i;
cout << h / i;
cout << endl;
}
system ("PAUSE");
return 0;
}

I just don't know the command required to go back to start.