C Preprocessor - C Programming Questions and Answers

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Will the program compile successfully?

#include 
 int main() 
 {  
    #ifdef NOTE    
       int a;       
       a=10;    
  #else        
       int a;      
       a=20;  
    #endif 
    printf("%d\n", a);  
    return 0; 
}

Yes

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Answer : Option A

Explanation :

Yes, this program will compile and run successfully and prints 20.

The macro #ifdef NOTE evaluates the given expression to 1. If satisfied it executes the #ifdef block statements. Here #ifdef condition fails because the Macro NOTE is nowhere declared.

Hence the #else block gets executed, the variable a is declared and assigned a value of 20.