Global variables in C++

How Global variables are used in C++?


Variables that are declared outside the scope of a function, so that it can be used anywhere in the program is known as Global Variables.

Example :

#include <iostream.h>
float pi = 3.14;
int main( )
int area,rad;
rad = 100;
area = pi*rad*rad;
cout << "Area of a Circle:" << area << '\n';
return 0;


Area of a Circle: 31400

In the above example "pi" is declared as global variable outside any function. But the "pi" value is used inside the main function.

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