Calculator

#include <cstdlib>
#include <iostream>

using namespace std;

int main()
{
    int a;
    int b;
    int c;
    cout << "1 for addition\n2 for subtraction\n3 for Multiplication\n4 for Division\n";
    cin >> a;
    cout << "Enter first number." << "\n>";
    cin >> b;
    cout << "Enter second number\n>";
    cin >> c;

    if(a == 1)
    {
        cout << b+c;
    }
    else if(a == 2)
    {
        cout << b-c;
    }
    else if(a == 3)
    {
        cout << b*c;
    }
    else if(a == 4)
    {
        cout << b/c;
    }
    else
    {
        cout << "1 for Addition\n2 for Subtraction\n3 for Multiplication\n4 for Division\n";
    }

    system("PAUSE");
    return 0;
}