Preprocessor Directive MCQ 1 : Pre Incrementing Macro

Guess What will be the output of following Code Snippet -

#include<stdio.h>
#define MAX 10
int main(){
    int num;
    num = ++MAX;
    printf("%d",num);
    return 0;
}

Options :

1. 10
2. 11
3. Compile Error
4. Run-time Error

Compile Error

Explanation :

num = ++MAX;
will be expanded as -
num = ++10;
    = Compile Error

• Macro Preprocessor only replaces occurance of macro symbol with macro symbol value.
• Preprocessor replace MAX with 10.

Expanded Program :

int main(){
    int num;
    num = ++10;
    printf("%d",num);
    return 0;
}

• Above expanded code is now given to compiler.
• Compiler will throw error : Lvalue Require Error. (because increment/decrement operators should be used with variable)

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• mcq error/output in c (1)
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