Validate Configuration Register Layout

Code

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    unsigned short value = (*cfg).reg;
    if(value & 0x0001 == 0) {
        return 0;
    }
    unsigned short priority = (value >> 2) & 0x03;
    if (priority == 0x03) {
        return 0;
    }
    if ((value & 0xFFF0) != 0){
        return 0;
    }
    return 1;
}

int main() {
    ConfigRegister cfg;
    scanf("%hx", &cfg.reg);

    int result = validate_config(&cfg);
    printf("%d", result);

    return 0;
}

Solving Approach