What are global variables in C++?

Global variables are defined outside of all the functions, usually on top of the program. The global variables will hold their value throughout the lifetime of your program.

A global variable can be accessed by any function. That is, a global variable is available for use throughout your entire program after its declaration. 


#include <iostream>
using namespace std;
// Global variable declaration:
int g;
int main () {
   // Local variable declaration:
   int a, b;
   a = 10;
   b = 20;
   g = a + b;
   cout << g;
   return 0;


This will give the output −


Lakshmi Srinivas
Lakshmi Srinivas

Programmer / Analyst / Technician

Updated on: 11-Feb-2020

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