C-programming - Global variables, C++ global variables

Global variables

Global Variable

Variables declared outside of a block are called global variables. Global variables have program scope, which means they can be accessed everywhere in the program, and they are only destroyed when the program ends.

 #include <iostream.h>
   float pi = 3.14;
   int circlearea()
   int area,r;
   r=10
   area= pi*r*r;
   cout<< "area of circle: " << area << '/n';
int circlecircum()
   int circum, r;
   r=10;
   circum= 2*pi*r;
   cout<< " circumference of circle: " << circum << '/n';
int main( )
     {
       circlearea();
       circlecircum(); 
       return 0;
     }

output

area of circle: 314
circumference of circle:62.8

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