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 & 1u) != 1){
        // printf("Condition 1 failed\n");
        return 0;
    };

    if (((cfg->reg & 6u) > 2) >> 1){
        // printf("Condition 2 failed\n");
        return 0;
    };

    if((cfg->reg & 0xFFF0) != 0){
        // printf("Condition 3 failed\n");
        return 0;
    };

    return 1;
}

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

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

    return 0;
}