C + + binary Flip Case Analysis _c language

Source: Internet
Author: User

This article describes the C + + binary Flip method, the commonly used several solutions listed for everyone to compare the choice. Specifically as follows:

Let's take a look at a relatively clumsy algorithm:

#include <iostream>

using namespace std;

void printbinary (unsigned char str, int size = 1)
{
 int flag = 0x01;
 for (int i = 0; i < size; i++)
 {for
 (int i = 0; i < 8; i++)
 {
  if (str & (0x01 << (7-i)) )
  cout << "1";
  else
  cout << "0";
 }
 cout << Endl;;
 }}

unsigned char myswap (unsigned char data)
{
 unsigned char flag = 0x01;
 for (int i = 0, j = 7; I < J; i++, j--)
 {
 Int. right = data & (0x01 << i);
 int left = data & (0x01 << j);
 Data &= ~ (0x01 << j);
 Data &= ~ (0x01 << i);
 int dist = j-i;
 Data |= (right << Dist);
 Data |= (left >> dist);
 }
 return data;
}

void main (void)
{
 char source=0x07;
 int i;
 Printbinary (source, 1);
 unsigned char result = Myswap (source);
 Printbinary (result);
}

The following flip program is simple and efficient relative to the above example:

unsigned char swapbinary (unsigned char data)
{
 int sign = 1;
 unsigned char result = 0;
 for (int i = 0; I <= 7; i++)
 {result
 = (data & (sign << i)) >> i) << (7-i);
 } return result

 ;
}

The following reverse procedure is easier to understand:

unsigned char swapBinary2 (unsigned char data)
{
 data= (data & 0xf0) >> 4) | (Data & 0x0f) << 4); 
 Data= ((Data & 0xCC) >> 2) | (Data & 0x33) << 2); 
 Data= ((Data & 0xAA) >> 1) | (Data & 0x55) << 1); 
 return data; 
}

In the end, this Super Cow reversal program is a bunker ...

unsigned char codetable[16]={0x00, 0x08, 0x04, 0x0c, 0x02, 0x0a, 0x06, 0x0e, 0x01, 0x09, 0x05, 0x0d, 0x03, 0x0b, 0x07, 0x0 f}; 

unsigned char swapBinary3 (unsigned char data) 
{return 
 (Codetable[data >> 4]) | (Codetable[data & 0x0f] << 4);
}

I hope this article is helpful to the learning of C + + program algorithm design.

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