77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    unsigned short en=((cfg -> reg) & 1);
    unsigned short mode=((cfg -> reg) & (1<<1));
    unsigned short priority=((cfg -> reg) &(3<<2)); 
    unsigned short res=((cfg -> reg) &(0XFFF<<4));
    int result = ((en==1) && (priority != 11) && (res==0))? 1: 0;
    return result;
}

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

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

    return 0;
}