c program to use global variables | extern examples in c | C program to use multiples files using extern

 

global variables in C

 /* program to input a number from a different file using external variable and print that

*/

step1:

in devc++,

->click file menu

->click new

->project

-> click console application

->choose c project

->click ok

step 2

under 'main.c' write the code

#include <stdio.h>

extern int a;

void input();

int main() 

{

input();

printf("a=%d",a);

return 0;

}

-------

step 3

->right click the project folder on left side

->click new file as shown above . You can give a name you like

 Here we have taken as untitled3.c

->write the following code

#include<stdio.h>

int a;

void input()

{

 scanf("%d",&a);

}

->save it

->run the program