factorial.cpp

Data Abstraction & Problem Solving with C++源码

int factorial(int n)
// ------------------------------------------------------
// Computes the factorial of an integer.
// Precondition: n >= 0.
// Postcondition: Returns n * (n-1)*...*1, if n > 0;
// returns 1 if n = 0.
// ------------------------------------------------------
{
   int fact = 1;

   for (int i = n; i > 1; --i)
      fact *= i;

   return fact;
} // end factorial