list0403.cpp

teach yourself C++ in 21 days 第五版

// Listing 4.3 - demonstrates use of
// prefix and postfix increment and
// decrement operators
#include <iostream>
int main()
{
   using std::cout;
  
   int myAge = 39;      // initialize two integers
   int yourAge = 39;
   cout << "I am: " << myAge << " years old.\n";
   cout << "You are: " << yourAge << " years old\n";
   myAge++;            // postfix increment
   ++yourAge;          // prefix increment
   cout << "One year passes...\n";
   cout << "I am: " << myAge << " years old.\n";
   cout << "You are: " << yourAge << " years old\n";
   cout << "Another year passes\n";
   cout << "I am: " << myAge++ << " years old.\n";
   cout << "You are: " << ++yourAge << " years old\n";
   cout << "Let's print it again.\n";
   cout << "I am: " << myAge << " years old.\n";
   cout << "You are: " << yourAge << " years old\n";
   return 0;
}