77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    // Write logic using pointer access
    if ((cfg->reg & 0x01U) == 1 && (cfg->reg & (3 << 2U)) != 3){
        for (int i = 4; i < 16; i++){
            if ((cfg->reg >> i) & 0x01U){
                return 0;
            }
        }
        return 1;
    }
    return 0;
}

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

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

    return 0;
}