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how important is shift operators....?

 
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Hi Friends :
Till date I have worked all these years on Microsoft platform. Also I work on overseas projects its difficult for me to give as much time to as I wud want to prepare for THE exam.
I am struggling to understand Shift Operators and Bitwise operators. Infact I am struck. Logical and Arithmetic are juz fine for me.
My question to u is.. from point of view of exam HOW IMPORTANT is it to know these topics.. or can I juz skip. My aim is to pass it first(I am not 90+ kinda guy ...)
tks,
Ashish
 
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Hi Ashish,
I have writeen a small program to ease the shifting thing. Change according to your req.
public class ShiftTest {
public static void main(String[] args) {

int toBeShifted = 32;
int shiftBy = 34;
System.out.println("Binary representation for " + toBeShifted + " >> " + shiftBy + ":");
System.out.println("Binary for " + Math.abs(toBeShifted) + ": " + append(Math.abs(toBeShifted)));
System.out.println("Complement of above: " + append(~Math.abs(toBeShifted)));
System.out.println("Add 1: " + append((~Math.abs(toBeShifted)) + 1));
System.out.println("Shift by " + shiftBy + "(" + shiftBy%32 +"): " + append(((~Math.abs(toBeShifted)) + 1)>> shiftBy));
System.out.println("Complement: " + append(~(((~Math.abs(toBeShifted)) + 1)>> shiftBy)));
System.out.println("Add 1: " + append((~(((~Math.abs(toBeShifted)) + 1)>> shiftBy)) + 1));
System.out.println("=: " + (toBeShifted >> shiftBy)) ;

}

static String append(int no) {

String str = "";
int length = (Integer.toBinaryString(no)).length();
for( int i = 0; i < 32 - length ; i++) {

str += "0";
}
str += Integer.toBinaryString(no);
return str;
}

}
Santhosh.
 
Ashish Agnihotri
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Santosh :
Thanks for this reply too. But I am not getting it. I mean, I would be very happy if you can comment before each print as to what is being done.. its confusing for me ( which may be quite explicit.. may be I have mental block). Now I am determined to get through to learn Shift and Bit Operators.
take ur own time to do that.. but please do it.
tks,
Ashish
 
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Dear Santhosh :
Even i would appreciate if u could provide information requested by Ashish, since i m also stuck at these shift operators and this program too. Pls Let us know how important is this topic i relation to exam.
Anukampa
 
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Ashish/Anukampa, Go thru this, it might be helpful
http://www.javaranch.com/ubb/Forum24/HTML/005999.html
 
Ashish Agnihotri
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Vidya :
Thanks , although I have not read it.. ( its sunday ..) it seems with a resonably good explanation.
Can you ( or anybody also tell ...) how important are Shift Operators ( & bit ) from point of view of Exam ?
tks again,
Ashish
 
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Hi Ashish,
Coming back to your original question of "how important this
shift operator is from exam point of view"?-->I would say
It is better not to skip the topic as there is a chance of
getting atleast "one" question<if not two>:-)
good luck...
regds
NM
 
Santhosh Kumar
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Hi Ashish,
The program basically written to solve a doubt for Vidya. She had some problems with shifting -ve number. i.e. getting binary representation for -ve number and shifting. So program gives the step by step binary representation for shifting. Pl go thru the link provided by Vidya, there we discussed this in detail. Note: This program does only >> shifting. If you want to do << or >>>, you have to change the program accordingly (Basic rules remains same). Pl let me know, if you need some more info.
Santhosh.
 
Anu
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Thanx a ton guys for all yr help. Thanx Vidya. I will go thru information and let u know if i still face any prob.
Thanx again !!
Anukampa
 
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