77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    if((cfg->reg&1)&&
    (((cfg->reg>>2)&0x03)!=3)&&
    ((cfg->reg>>4)&0xFFF)==0)
    {return 1;}
    return 0;
} 
int main() {
    ConfigRegister cfg;
    scanf("%hx", &cfg.reg);

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

    return 0;
}