77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    // Write logic using pointer access
    unsigned short result = (*cfg).reg;
    if(result & 0x0001 == 0){
        return 0;
    }
    unsigned short priority = (result >> 2)  & 0x03;
    if(priority == 0x03){
        return 0;
    }

    if((result & 0xFFF0) != 0){
        return 0;
    }

    return 1;
}

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

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

    return 0;
}