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In the following program where is the variable a getting defined and where it is getting declared?

#include

int main()

{ extern int a;

printf("%d\n", a);

return 0;

} int a=20;

(a) extern int a is declaration, int a = 20 is the definition

(b) int a = 20 is declaration, extern int a is the definition

(c) int a = 20 is definition, a is not defined

(d) a is declared, a is not defined
asked in Programming by Veteran (14.8k points) 15 153 318 | 88 views
Answer is A .

Extern int a declares that there will be a variable a of integer type in upcoming lines.

Int a=20 defines the variable
is 'a' used in both places same??as it is outside main()

http://www.geeksforgeeks.org/understanding-extern-keyword-in-c/

Please refer to this link to know more about extern variables!!

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