GO Classes Test Series 2024 | Mock GATE | Test 11 | Question: 21

Answer 1

If you run the programs as:
gcc main.c foo.c
./a.out

then you will get 1 as output

• You won’t get compile time error as foo() being referred is being compiled as well, and so the definition would be known to compiler.
• You may get warnings due to printf() definition not being available at compile time, but linker gets the precompiled object file from C-library.

Answer 2

/* main.c */

#include <stdio.h>

void foo(); // Declare foo before calling it

int main()

{ 

foo();

return 0;

}

/* foo.c */

#include <stdio.h>

extern int i=1; // Declare i as external

void foo()

{

printf("%d", i);

}

 

I think this  should be the corrected code.