How do you subtraction two numbers using bitwise operator?

Answer 1

#include<stdio.h>

#include<conio.h>

void main()

{

int x,y;

clrscr();

printf("\n enter the elements\n");

scanf("%d%d",&x,&y);

printf("\n before swaping x=%d,y=%d",x,y);

x=x^y;

y=y^x;

x=x^y;

printf("\n after swaping x=%d y=%d",x,y);

getch();

}

Answer 2

not 100% sure if this is what you are asking for but here it goes.

you have a number 11110000 (binary) and you want 00001111 (binary)?

you want to use the xor operator ^

value = 0xf0; //11110000 binary

printf("before %d\n");

value ^= 0xff; //11111111 binary

printf("after%d\n");

output:

before 240

after 15

240 in binary is 11110000

15 in binary is 00001111

^

The example provided above gives the illusion that bit order was reversed.

Function revbyte(inbyte As Byte) As Byte

For i = 0 To 7

revbyte= revbyte Or 2 ^ (7 - i) * IIf((inbyte And 2 ^ i) > 0, 1, 0)

Next

End Function

Answer 3

If you have to bits, A and B, then their sum is {A-and-B, A-xor-B} (two bits).

Note: Sometimes you have to add three bits (A, B and C), then the sum is {(A-and-B)-or-(A-and-C)-or-(B-and-C),(A-xor-B)-xor-C} (two bits).

See the attached links for details.

Answer 4

package others;

public class AddTwoNumbers {

private static int myAdd(int a, int b)

{

int carry = a & b;

int result = a ^ b;

while(carry != 0)

{

int shiftedcarry = carry << 1;

carry = result & shiftedcarry;

result ^= shiftedcarry;

}

return result;

}

public static void main(String[] args){

System.out.println(myAdd(4, 5));

System.out.println(myAdd(4, -5));

System.out.println(myAdd(-4, -5));

System.out.println(myAdd(-4, 5));

System.out.println(myAdd(0, 5));

}

}

output :

9

-1

-9

1

5

Answer 5

If you mean, in a computer program, in Python you can swap the value of two variables like this:

a, b = b, a

But in most programming languages, you need an intermediate variable:

temp = a

a = b

b = temp

Answer 6

Without temporary variable:

void swap( int& x, int&y ) { x ^= y ^= x ^= y; }

With temporary variable:

void swap( int&x, int& y ) { int t=x; x=y; y=t; }

Answer 7

a := a XOR b

b := a XOR b

a := a XOR b