bitwise manipulators

[Ben Hultin]

I am working on a program that requires the use of bitwise manipulators. The problem is that while I can find a lot of articles explaining it lengthy paragraphs, I have yet to find one containing syntax on using it.

The setup I need to create is:

   

if (number > 0) {
		If number is greater than zero, use the >>= operator to do one arithmetic-right shift.
		
		} else if (number == 0) {
		If number equals zero, use the ~ operator to complement it.
		
		} else if (number < 0) {
		If number is less than zero, use the <<= operator to do one left shift.
		} 

 

I am just not sure how to properly use manipulators. If you could show me syntax that would be fantastic or better yet show me to an article that contains actual syntax.

I appreciate the help

[Jesper de Jong]

The operators work just like any other operators such as +, -, * and /.

int a = 3478;
int b = a << 3;  // shift a 3 bits to the left and store the result in b

a >>= 4;  // shift a 4 bits to the right and store the result in a

int c = ~b;  // invert the bits of b and store the result in c

[Campbell Ritchie]

Long time since I wrote about bitwise operators. Try here.

[Rajeev Trikha]

Play with this code to clarify your views.

byte number = 0;
if (number > 0) {
System.out.println("Pre: " + number);
number >>= 1;
System.out.println("Post: " + number);

} else if (number == 0) {
System.out.println("Pre: " + number);
number = (byte) ~number;
System.out.println("Post: " + number);
} else if (number < 0) {
System.out.println("Pre: " + number);
number <<= 1;
System.out.println("Post: " + number);
}