ex03_50.cpp

《c＋＋大学教程》源码

// Exercise 3.50: ex03_50.cpp
// What does this program do?
#include <iostream>

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

int mystery( int, int );  // function prototype
      
int main()
{
   int x, y;
   
   cout << "Enter two integers: ";
   cin >> x >> y;
   cout << "The result is " << mystery( x, y ) << endl;

   return 0;  // indicates successful termination

} // end main
   
// Parameter b must be a positive
// integer to prevent infinite recursion
int mystery( int a, int b )
{
   // base case
   if ( b == 1 )
      return a;

   // recursive step
   else
      return a + mystery( a, b - 1 );

} // end function mystery


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