有符号数和无符号数的移位操作

3152阅读　0评论2012-07-25　时间看来
分类：C/C++

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  1. /*C provides six operators (&, |, ^, <<, >>,~)for bit manipulation;
  2.  * these may only be applied to integral operands, that is, char, short, int,
  3.  * and long,whether signed or unsigned.
  4.  */

  6. #include <iostream>
  7. using namespace std;

  9. int main() {
  10.     cout << "!!!Hello World!!!" << endl; // prints !!!Hello

  12.     /*二进制输出*/
  13.     cout.setf(ios::hex,ios::basefield);

  15.     int i = 0x80000000;
  16.     cout << "i = " << i <<endl;
  17.     i = i >> 1;
  18.     cout << "after move i = " << i << endl;

  20.     unsigned int ui = 0x80000000;
  21.     cout << "ui = " << ui <<endl;
  22.     ui = ui >> 1;
  23.     cout << "after move ui = " << ui << endl;

  25.     return 0;
  26. }
  27. //right shift
  28. //!!!Hello
  29. //i = 80000000
  30. //after move i = c0000000
  31. //ui = 80000000
  32. //after move ui = 40000000*/

  34. //left shift
  35. //!!!Hello
  36. //i = 80000000
  37. //after move i = 0
  38. //ui = 80000000
  39. //after move ui = 0

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