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hasnain

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From: Chichawatni

Registered: 2014-10-13

Posts: 8,355

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Determine output:

Directions:

#include<stdio.h>
#define clrscr() 100
void main()
{
      clrscr();
      printf("%dn", clrscr());
}

Question:
Determine output:

Option A):
1
Option B):
0
Option C):
Error
Option D):
100

Correct Answer is Option D):
100

Explanation:
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\n", 100);
}

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

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