bool or

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

#define DF_1 1
#define DF_2 2

static bool bVar = false;
int iTestVar;


int main (int argc, char **argv){

    iTestVar = 1;

    bVar = iTestVar == DF_1 || iTestVar == DF_1;

    printf("(1) %s\n", bVar ? "true" : "false");

    bVar = iTestVar == DF_1 || iTestVar == DF_2;

    printf("(2) %s\n", bVar ? "true" : "false");

    bVar = iTestVar == DF_2 || iTestVar == DF_1;

    printf("(3) %s\n", bVar ? "true" : "false");

    bVar = iTestVar == DF_2 || iTestVar == DF_2;

    printf("(4) %s\n", bVar ? "true" : "false");

return 0;
}

/*
output:

(1) true
(2) true
(3) true
(4) false

*/