list0503.cpp

teach yourself C++ in 21 days 第五版

// Listing 5.3 - demonstrates variables
// scoped within a block
  
#include <iostream>
  
void myFunc();
  
int main()
{
   int x = 5;
   std::cout << "\nIn main x is: " << x;
  
   myFunc();
  
   std::cout << "\nBack in main, x is: " << x;
   return 0;
}
  
void myFunc()
{
   int x = 8;
   std::cout << "\nIn myFunc, local x: " << x << std::endl;
  
   {
      std::cout << "\nIn block in myFunc, x is: " << x;
  
      int x = 9;
  
      std::cout << "\nVery local x: " << x;
   }
  
   std::cout << "\nOut of block, in myFunc, x: " << x << std::endl;
}