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C | Functions | Question 8

What is the meaning of using extern before function declaration? For example following function sum is made extern
extern int sum(int x, int y, int z)
    return (x + y + z);


Function is made globally available


extern means nothing, sum() is same without extern keyword.


Function need not to be declared before its use


Function is made local to the file.


Please comment below if you find anything wrong in the above post
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