What is the output of the following C program?

Rudra Pratap Singh • 3.39K Points
Extraordinary

Q. What is the output of the following C program?

Code:

#include <stdio.h>

int main()
{
   printf("Hello World! %d \n", x);
   return 0;
}

(A) Hello World! x;
(B) Hello World! followed by a random value
(C) Compilation error
(D) Hello World!

Correct Answer - Option(C)
Views: 126
Filed under category C Programming

Explanation by: Rudra Pratap Singh

This results in an error because the variable x is used without prior declaration. The output is as follows:

$gcc prog1.c
pgm1.c: In function ‘main’:
pgm1.c:4: error: ‘x’ undeclared (first use in this function)
pgm1.c:4: error: (Each undeclared identifier is reported only once
pgm1.c:4: error: for each function it appears in.)

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