77. Validate Configuration Register Layout

#include <stdio.h>
#include <stdint.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    // Write logic using pointer access
    uint8_t enable = cfg->reg & 0x01;
    uint8_t priority = (cfg->reg >> 2) & 0x03;
    uint8_t reserved = cfg->reg >> 4;
    if (enable == 1 && priority != 0x03 && reserved == 0){
        return 1;
    }
    return 0;
}

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

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

    return 0;
}