Prototype Declaration Outside a function

main()

{

. . .

}

int sum(int a, int b);

void prt(int vol)

{

sum(. . . );

. . .

}

float prod(float x, int y)

{

. . .

}

The main() function does not know sum(). It cannot used sum (correctly).

The functions following the sum prototype declaration can use sum() function.

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