77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

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

    if(enable && (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;
}