list0501.cpp

teach yourself C++ in 21 days 第五版

// Listing 5.1 - demonstrates the use of function prototypes
  
#include <iostream>
int Area(int length, int width); //function prototype
  
int main()
{
   using std::cout;
   using std::cin;
  
   int lengthOfYard;
   int widthOfYard;
   int areaOfYard;
  
   cout << "\nHow wide is your yard? ";
   cin >> widthOfYard;
   cout << "\nHow long is your yard? ";
   cin >> lengthOfYard;
  
   areaOfYard= Area(lengthOfYard, widthOfYard);
  
   cout << "\nYour yard is ";
   cout << areaOfYard;
   cout << " square feet\n\n";
   return 0;
}
  
int Area(int len, int wid)
{
   return len * wid;
}