Variables can be local to a block : block scope variable « Language Basics « C++ Tutorial

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C++ Tutorial » Language Basics » block scope variable

1.6.2.Variables can be local to a block

#include <iostream> 

using namespace std; 

 

int main() { 

  int x = 19; // x is known to all code. 

 

  if(x == 19) { 

    int y = 20; 

 

    cout << "x + y is " << x + y << "\n"; 

  } 

 

  // y not known here. 

 

  return 0; 

}

x + y is 39

1.6.block scope variable
	1.6.1.	Variable block scope
	1.6.2.	Variables can be local to a block
	1.6.3.	Inner block variable scope
	1.6.4.	Names in inner scopes can hide names in outer scopes.
	1.6.5.	Using the scope resolution operator: '::'
	1.6.6.	global and block scope
	1.6.7.	scope code block
	1.6.8.	global variables across functions
	1.6.9.	Using the scope resolution operator (2)

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