External storage class

external storage class is used to declare variable that are defined in other source file it is used to provide reference to a global variable that is defined in another class.

Storage -> memory

Default initial value -> zero

Scope -> global

Life -> as long as the program execute does not come to an end.

#include<stdio.h>

int x=21;

int main()

{

extern int y;

printf(“%d %d”, x , y);

return 0;

}

int y=31;

Output:21 31

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