a++,++a,!,~

Learn to position and and or so on , Realization function

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       // a++ Is to give value , after ++
       
       

       
       ！ Right and wrong 
       
       

       
       ~ Take the opposite 
       
       

       
       int 
       
       main()
       
       
{
       
       
  
       
       int 
       
       a 
       
       = 
       
       15;
       
       
  
       
       // 0000....001111
       
       
  
       
       a 
       
       = 
       
       a 
       
       & (
       
       ~(
       
       1 
       
       << 
       
       2));
       
       

       
       
  
       
       printf(
       
       "%d\n", 
       
       a);
       
       
  
       
       return 
       
       0;
       
       
}
      
      
      
      

       
       
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