Repetition in C++

The for Statement

Here is another version of factorial that uses a for statement to calculate factorial iteratively:

int factorial(int n) { int p = 1; for (int i = n; i > 0; i--) p *= i; return p; }

Compare:

int factorial(int n)
{
  int p = 1;
  while ( n > 0 ) {
    p = p*n;
    n = n-1;
  }
  return p;
}