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 num=cfg->reg;
    if(num&1)
    {
        if((num>>1&3)<=2)
        {
            if(!(num>>4&0xff))
            return 1;
        }
    }*/
    if(cfg->reg&1)
    {
        if((cfg->reg>>4&0xff)==0)
        if((cfg->reg>>2&3)<=2)
        return 1;
    }
    return 0;
}

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

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

    return 0;
}