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 priority = ((cfg->reg)>>2) & 0x3;
    uint8_t reserved = ((cfg->reg)>>4) & 0xFF;
    if ((cfg->reg) & 1){
        if (priority ==0 || priority == 1 || priority == 2 || priority==3){
            if (reserved == 0){
                return 1;
            }
        }
    }
    return 0;
}

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

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

    return 0;
}