Source of fact.cpp

Structures and functions

  1: //  Created by Frank M. Carrano and Timothy M. Henry.
  2: //  Copyright (c) 2017 Pearson Education, Hoboken, New Jersey.

  4: /** Computes the factorial of the nonnegative integer n.
  5:  @pre  n must be greater than or equal to 0.
  6:  @post  None.
  7:  @return  The factorial of n; n is unchanged. */
  8: int fact(int n)
  9: {
 10:    if (n == 0)
 11:       return 1;
 12:    else // n > 0, so n-1 >= 0. Thus, fact(n-1) returns (n-1)!
 13:       return n * fact(n - 1); // n * (n-1)! is n!
 14: }  // end fact