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 reg = cfg->reg;
    int valid =0;
    int enable = (reg) & 0b1;
    int reserved = 0;
    int priority = (reg >> 2) & 0b11;
    reserved = (reg >> 4);
    if (enable == 1 && priority < 3 && reserved ==0 ) {
        valid = 1;
    }
    
    return valid;
}

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

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

    return 0;
}