How do I use "cin" and "cout" in C++ with TextMate?

I am new to both C++ and TextMate, and I'm running into a problem. When I run my extremely basic "programs" in TextMate using C++, it completely ignores the statement "cout >>" and just either ignores it, or inputs the maximum data value for the basic type I used.

What is going on, and how can I stop it?

The source code is as follows:

#include 
int stonetolb(int);
int main() {
    using namespace std;
    int stone;
    cout << "enter the weight in stone";
    cin >> stone;
    int pounds = stonetolb(stone);
    cout << stone << "stone = ";
    cout << pounds <<" pounds.";
    return 0;
}

int stonetolb(int sts) {
    return 14 * sts;
}

… and the output, regardless of whether or not I even try to put in a number is:

enter the weight in stone0stone = 0 pounds.