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}

Global Variables
Global variables are defined outside a function, usually on top of the program. Global
variables hold their values throughout the lifetime of your program and they can be accessed
inside any of the functions defined for the 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. The following program shows how
global variables are used in a program.
A program can have same name for local and global variables but the value of local
#include <stdio.h>

/* global variable declaration */

int g;

int main ()
{

/* local variable declaration */
int a, b;

/* actual initialization */

a = 10;
b = 20;

g = a + b;

printf ("value of a = %d, b = %d and g = %d\n", a, b, g);

return 0;
}

variable inside a function will take preference. Here is an example:
#include <stdio.h>

/* global variable declaration */

int g = 20;

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