focal shift

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A clever substitution between division and arithmetic right shift

On most machines, the division of integers is slow and requires more than 30 clock cycles, divided by the power of 2, and can be implemented with shift operations. Code on first #include "stdio.h"int main (){int x=-128;int Y=X/4;printf ("y=%d", y);} Attach the assembly code again PUSHL%EBP. Cfi_def_cfa_offset 8. Cfi_offset 5,-8MOVL%esp,%EBP. Cfi_def_cfa_register 5Andl $-16,%espSubl $32,%espMovl $-128, (%ESP)MOVL (%ESP),%eaxLeal 3 (%EAX),%edxTestl%eax

Shift operation in C Language

I have written a small program that displays the binary representation (complement) of int type data. The Code is as follows:# Include Int main (void) {int I = 0; int value =-128; // 0xffffff80 int shift = INT_MIN; // 0x80000000Printf ("The decimal value is: % d \ n", value );Printf ("***** \ n"); // print marksFor (I = 0; I Shift = shift> 1; // right

A brief analysis of C + + shift operation and binary conversion

The shift operations include "logical Shift" (logical shift) and "arithmetic Shift" (arithmetic shift).Logical shift: bit discarded, vacant bit (vacant bit) filled with 0.Arithmetic shift

Java shift Operators <<, >>, >>>

The Java shift operators are all about these three kinds of:1. Left shift operatorThe left shift operator 1) Its general format is as follows:Value NUM Specifies the number of bits to shift the value to move.Left-shift rule only remembers one point: Discard the highest bit (

The Linux command learns the shift command

Tags: gif start SID String Article board note data-principlePositional parameters can be shift shifted left with the command. For example, the shift 3 original $4 now become $1 , the original $5 now become and $2 so on, the original $1 , $2 $3 Discard, $0 do not move. Commands with no parameters are shift equivalent shift

Problems with string shift--problem-solving notes

problems with string shift--problem-solving notes Title Description: Given the two strings S1 and S2, it is required to determine the string inclusions that can be obtained by S1 doing a cyclic shift (rotate) at S2 time. For example, given S1=AABCD and S2=cdaa, returns true; given S1=ABCD and S2=ACBD, returns false. Solution 1: A direct method of traversing a string S1 after all shifts, each of which is

Right Shift of array Loops

Right Shift of array LoopsFirst, suppose we have an array with 6 elements: 1, 2, 3, 4, 5, 6. Now we need to shift this array four times to the right, and we can directly launch it As a result: 3, 4, 5, 6, 1, 2. But how can we solve this problem? I think the easiest way to think of this is: Step 1: Save the value of the last element in the array. Step 2: Move the first element to the last element to the righ

A talk C Chestnut bar (33rd time: C-language example-skillfully use shift)

Ladies and gentlemen, crossing, the last time we talked about the example of greatest common divisor, this time we say the example is: skillfully use shift. GossipHugh, the words return to the positive turn. Let's talk C chestnuts together!We talked about the bit operation in the 19th, and gave some simple examples. So there's not much to say here. If any crossingForget the bit operation related content, you can click here to find the original text.Wh

Sethc.exe new image hijacking technology and security defense! (Shift backdoor)

Many of my friends sent me a shift backdoor, with image hijacking, you can press shift 5, and then enter the password. 5. shift does not close, and right-click the box to the bottom right corner of the box... the premise is to run p processing or reg first. This method is better than X .. the Registry is as follows: WindowsRegistryEditorVersion5.00 [HKEY_LOCAL_MA

Java_ bitwise operations (SHIFT, bit and, or, XOR, non)

Public classTest { Public Static voidMain (string[] args) {//1. Shift Left (//0000 0000 0000 0000 0000 0000 0000 0101 Then shift left 2 bit, low 0:// //0000 0000 0000 0000 0000 0000 0001 0100 Converted to 10 inSYSTEM.OUT.PRINTLN (5 //The result of the operation is//2, right Shift (>>) high fill sign bit//0000 0000 0000 0000 0000 0000 0000 0101 Then right-

is driving school all wrong? That's the right shift for everyday driving.

is driving school all wrong? That's the right shift for everyday driving.Remember when the coach taught us about shift skills during the three training sessions at the driving school? Hang a gear, loose clutch start, the wheel moves up immediately change 2, Speed 20 immediately 3 block, then immediately 4 block, 5 block. So that the subject of the three examinations, it is generally required to change gears

In Asp.net, right-click shielding, CTRL + N, Shift + F10, F11, F5 refresh, and backspace keys are blocked.

Right-click the block, CTRL + N, Shift + F10, F11, F5 refresh, and return key. The original text is as follows: // Block the function document by right-clicking, CTRL + N, Shift + F10, F11, F5 refresh, and backspace. oncontextmenu () {event. returnvalue = false;} // right-click the screen and select function window. onhelp () {return false} // block the F1 help function document. onkeydown () {If (window

The variable value (Ctrl+shift+i is not valid) in the Quick View breakpoint at the Android Studio debugging process?

When you're doing keymap to eclipse, in the debug process, we like to use Ctrl+shift+i to see the results of an operation or invocation in Eclipse, which is handy. But after keymap to eclipse, you will find that the shortcut key cannot be made. What is the reason why we exclude each:1, whether the accelerator mapping failed,2, the mapping is successful, you see the shortcut keys also found to be normal, then check whether the shortcut key conflicts.3,

Instead of multiplication arithmetic, the C + + shift calculation

Test shift and multiplication comparison, found that the shift is faster than the multiplication operation of a bit speed, but the difficulty is to determine whether it is 2 of the power of the second number, if not also through the code to split to 2 Power + on the molecular fatigue and then through the shift to get 2 of the power of the number of such;The follo

<< and >> shift operators for PHP

Let's give you two examples.1 $b = ten; 2 $b $b ; 3 Echo $b // Output$b = ten; $b $b >> 3; Echo $b; Output 1It can be found that the left displacement is multiplied by the corresponding number and the right displacement is divided by the corresponding number if the floating-point number is drawn, the decimal place is taken out, and the integer is used, the displacement operation is actually the operation of the binary number.Displacement operatorThe essence of the left

Java bitwise operations (SHIFT, bit and, or, XOR, non)

Public classTest { Public Static voidMain (string[] args) {//1. Shift Left (//0000 0000 0000 0000 0000 0000 0000 0101 Then shift left 2 bit, low 0:// //0000 0000 0000 0000 0000 0000 0001 0100 Converted to 10 inSYSTEM.OUT.PRINTLN (5 //The result of the operation is//2, right Shift (>>) high fill sign bit//0000 0000 0000 0000 0000 0000 0000 0101 Then right-

Always a blur shift operation

First of all, we need to understand that all bit operations in the C language refer to the bitwise operations of binary numbers. Even if you enter a decimal number, it is stored in memory as a binary form. " C language in the shift operation, the content is not much. But in some places you don't pay attention, you are negligent. Gossip less, first do two small questions first. (1) unsigned char x=3; How much is x 3 written in binary number is 00

Left-right shift operation

7, the left-shift operator (Actually the left one is equal to the number multiplied by 2, and the 2 bit is equal to the number multiplied by 4, and so on. This situation is limited to the case where the mobile bit does not contain 1. 8, the right shift operator (>>) is a binocular operator whose function is to shift all the digits of the operand to the left of th

How to disable the cut operation of the Shift+delete shortcut key in Visual Studio 2012

When writing code in Visual Studio 2012, a frequently used shortcut key is Shift+delete (deletes an entire row). Just from the previous post (Visual Studio 2012 annoying default setting: Ctrl-c will copy empty rows to empty the Clipboard), you know that this shortcut will be cut: The mentality is better: Not only will ctrl-c occupy the Clipboard, Ctrl-x will also use the entire row deletion (shift delete

Elasticsearch Learning problem record--invalid shift value in prefixcoded bytes (was encoded value really an INT?)

Recently in an e-commerce project, where there is a strange phenomenon in commodity search, there will be a decrease in the number of items depending on the sort of field. According to the general road or can not be found, or normal display, why the increase in accordance with the sales order will result in a reduction in query results. Check the ES log found error:nested: numberformatexception[invalid shift value in prefixcoded bytes (is Encoded

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