phép toán trên bit

#include <stdio.h>
#define NUM 2

int main()
{
    int a,b;

    int va_np, hoac_np, tru_np, dich_trai, dich_phai, dao_bit;

    printf("\n Nhap hai so a, b: ");
    scanf("%d %d",&a,&b);

    va_np = a&b;
    printf("\n  a&b = %d",va_np);

    hoac_np = a|b;
    printf("\n a|b = %d",hoac_np);

    tru_np = a^b;
    printf("\n a^b = %d",tru_np);

    dich_trai = a<<NUM;
    printf("\n a dich trai 2 bit: %d",dich_trai);

    dich_phai = b>>NUM;
    printf("\n b dich phai 2 bit: %d",dich_phai);

    dao_bit = ~a;
    printf("\n dao bit cua a: %d",dao_bit);

    return 0;
}