77. Validate Configuration Register Layout

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    unsigned short reg = cfg -> reg ;
    unsigned short val1 = (reg&0x01),val2 =((reg>>1)&(0x03)),val3 = (reg>>4);

    if((val1) && (val2<3) && (val3 == 0)){
        return 1;
    }
    return 0;
}

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

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

    return 0;
}