Validate Configuration Register Layout

Code

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    // Write logic using pointer access
    unsigned short mask;
    if(cfg->reg & 0x01){
        mask = 3;
        if((cfg->reg & (mask << 2)) != (3<<2)){
            if((cfg->reg & ~(0x0F)) == 0){
                return 1;
            }
        }
    }
    return 0;
}

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

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

    return 0;
}

Solving Approach