fig06_32.cpp

c++大学教程第5版的配套书源代码

// Fig. 6.32: fig06_32.cpp
// Testing the iterative factorial method.
#include <iostream>
using std::cout;
using std::endl;

#include <iomanip>
using std::setw;

unsigned long factorial( unsigned long ); // function prototype

int main()
{
   // calculate the factorials of 0 through 10
   for ( int counter = 0; counter <= 10; counter++ )
      cout << setw( 2 ) << counter << "! = " << factorial( counter ) 
         << endl;

   return 0;
} // end main

// iterative method factorial
unsigned long factorial( unsigned long number )
{
   unsigned long result = 1;

   // iterative declaration of method factorial
   for ( unsigned long i = number; i >= 1; i-- )
      result *= i;

   return result;
} // end function factorial



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