77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    if((cfg->reg & 0x01)==1) //Enable ON
    {
        
        if(((cfg->reg & 0x0C)>>2)<=2)
        {
           
            if((cfg->reg & 0xFFF0) == 0)
            {
              
                return 1;
            }
        }
    }
    return 0;
}

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

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

    return 0;
}