ex18_19.cpp

《c＋＋大学教程》源码

// Exercise 18.19: ex18_19.cpp
// This program determines if a value is a multiple of X.
#include <iostream>

using std::cout;
using std::cin;
using std::endl;

bool multiple( int );

int main()
{
   int y;

   cout << "Enter an integer between 1 and 32000: ";
   cin >> y;

   if ( multiple( y ) )
      cout << y << " is a multiple of X" << endl;
   else
      cout << y << " is not a multiple of X" << endl;

   return 0;

} // end main

// determine if num is a multiple of X
bool multiple( int num )
{
   bool mult = true;

   for ( int i = 0, mask = 1; i < 10; i++, mask <<= 1 )

      if ( ( num & mask ) != 0 ) {
         mult = false;
         break;

      } // end if

   return mult;

} // end function multiple

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