67. Control Register Using Nested Bitfields

#include <stdio.h>

typedef union {
    unsigned char reg;
    struct {
        unsigned char enable : 1;
        unsigned char mode : 1;
        unsigned char priority : 2;
        unsigned char reserved : 4;
    } bits;
} ControlRegister;

// Write your logic here
int validate_register(ControlRegister *ctrl) {

    unsigned char check_Enable = ctrl->bits.enable;
    unsigned char check_Mode = ctrl->bits.mode;
    unsigned char check_Priority = ctrl->bits.priority;
    unsigned char check_Reserved = ctrl->bits.reserved;

    for(int i = 0; i < 8; i++){
        if(check_Enable == 1 && check_Reserved == 0 && check_Priority <= 2){
            return 1;
        }
        else{
            return 0;
        }
    }

    return 0;
}

int main() {
    ControlRegister ctrl;
    scanf("%hhx", &ctrl.reg);

    int result = validate_register(&ctrl);
    printf("%d", result);

    return 0;
}