gcd.cpp

C++上机课的习题答案

// gcd.cpp
//求两个整数的最大公分母.
//思考：两个整数的最小公倍数应该怎么求？
#include <iostream>

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

/* write prototype for gcd */

int main()
{
   int a;
   int b;

   // allow the five sets of numbers to be input
   for ( int j = 1; j <= 5; ++j ) {    
      cout << "Enter two integers: ";
      cin >> a >> b;
      cout << "The greatest common divisor of " << a 
           << " and " << b << " is "
           <<  /* write call for gcd */ << "\n\n";

   } // end for

   system("PAUSE");
   return 0;

} // end main

// function gcd definition
/* write header for gcd */
{
   int greatest = 1;

   for ( int i = 2; i <= ( ( x < y ) ? x : y ); ++i )

      if ( /* write condition to determine if both x and y are 
           divisible by i */ )
         greatest = i;

   /* write a statement to return greatest */

} // end function gcd