Answer Posted / pravat kumar patra

main() is a user defind function.because we write some codes
inside main to perform certain task.but in case of sqrt() if
write the function in a program it executes.but we have not
to write the function body.
consider the case:-
void main() void main()
{ {
printf("hello"); inti=25,p=sqrt(i);
} printf("%d",p);
}

use header file math.h.

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