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;
    unsigned short enable=reg&0x01;
    unsigned short valid=(reg>>2)&0x03;
    unsigned short status=(reg>>4)&0xfff;

    if(enable==1 && valid!=3 && status==0)
    return 1;
    return 0;
}

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

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

    return 0;
}