Validate Configuration Register Layout

Code

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    // Write logic using pointer access
    if (!((*cfg).reg & 0x01)) {
        return 0;
    }

    if (((*cfg).reg & 0x0C) == 0x0C) {
        return 0;
    } 

    if ((*cfg).reg & 0xfff0) {
        return 0;
    }

    return 1;
}

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

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

    return 0;
}

Solving Approach