Question

How to create a macro that check if a number is odd or even in C

Answer 1

#include <stdio.h>

#define EVEN_OR_ODD(num)               \
            if (num & 1)               \
                printf("odd\n", num);  \
            else                       \
                printf("even\n", num); 


int main() {

    int x = 4;

    EVEN_OR_ODD(x);
    
    return 0;
}




/*
run:

even

*/

 

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Answer 2

#include <stdio.h>

#define IS_ODD(x) (x & 1)

int main()
{
    int num = 12;

    if (IS_ODD(num))
        printf("Odd");
    else
        printf("Even");

    return 0;
}




/*
run:

Even

*/

 

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