Factorial

The factorial n! is the product 1 * 2 * 3 * ... * n. By definition 0! is 1.

Start a result at 1, then multiply it by every integer from 2 up to n in a loop. (The tests keep n at most 10, so the answer fits in an int.)

Complete int factorial(int n) to return n! = 1 * 2 * ... * n. Assume 0 <= n <= 10, and factorial(0) is 1.

/* Return n! = 1*2*...*n. Do not write main(). */
int factorial(int n) {
    return 0;   /* change this */
}

Click Run to see the output here.

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Factorial

Factorial

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