Determine Output - C Programming MCQs

Rajeev Malhotra • 3.97K Points
Extraordinary

Q. Determine Output

Code:

#define clrscr() 100
void main()
{
      clrscr();
      printf("%d", clrscr());
}

(A) 0
(B) 1
(C) 100
(D) Error

Correct Answer - Option(C)
Views: 128
Filed under category C Programming

Explanation by: Rajeev Malhotra

Preprocessor executes as a seperate pass before the execution of the compiler. So textual replacement of clrscr() to 100 occurs. The input program to compiler looks like this :

void main()
{
      100;
      printf("%d", 100);
}

Note: 100; is an executable statement but with no action. So it doesn't give any problem.

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