77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    int a=cfg->reg&1;
    int b=(cfg->reg&0xC);
    b=(b>>2);
    int c=(cfg->reg&0xfff0);
    if(a==1 && b!=3 && c==0 ) return 1;
    else return 0;
}

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

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

    return 0;
}