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Tuesday, 29 May 2012

what is Extern keyword?

extern keyword in c

Keyword extern is used for declaring extern variables in c. This modifier is used with all data types like int, float, double, array, pointer, structure, function etc.
Important points about extern keyword:
1. It is default storage class of all global variables as well all functions. For example, Analyze following two c code and its output:
(a)
#include <stdio.h>
int i;    //By default it is extern variable
int main(){
    printf("%d",i);
    return 0
}

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