C++ Random # Generation

So, how can I randomly generate numbers into a program like this?

double triangleArea(double t)
{
        double base;
        double height;
        double answerT;
        cout << "Enter the Base of the Triangle: ";
        cin >> base;
        cout << "Enter the Height of the Triangle: ";
        cin >> height;
        answerT = .5 * base * height;
        cout << "The Area of the Triangle is: " << answerT << "." << endl;
        return answerT;
}

This is inside a function, because I have selection of multiple functions inside main. I want the program to randomly generate numbers into the function itself so the user doesn't have to.

I tried to change the cin's to base = rand(); and height = rand();...this doesnt work...in fact, even if i take the cout's out of the function, it still cout's those strings...WTF?

>>18

Well, it depends how important the randomness is to you. If you just need something kind of random (e.g. to use with the original code he posted) rand and srand will be fine.