c++ - Bit representation not being printed correctly for long int -

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I am trying to represent some of the lengths of a long integer as a bitboard for my chess program of this variable I am using. However, the representation is not printed correctly. I am using the following code 

  zero displayboard () {bitsy    
 The first two rows transform it into a binary presentation using the  bitset  class and print it  
 However, when I try to do this by using code in the loop, then gives me the following output: 
  11111111111111110000000000000001111111111111110000000000000001  
 The right output is :  111111111111111100000000000000000001000000000000001111111111111111   
  fullBoard  is the value that I am using:  0xFFFF00000000FFFF   
 I am compiling using the following command: C ++ 11:  G ++ board.cpp -std = c ++11   
 Why is this code incorrectly outputing? I do not think there is an error in the loop.   
 
 
 I think the problem is here: < 
  if (fullbirds & amp; (1 <> )   
 It can be:  
  if (fullBoard & Amp; (1ULL & lt; & lt ; I))   
 The reason for this is that  1 & lt; & Lt; I  is evaluated as an int, which is probably 32 bits in your case, so UB once gets more than  i  31. To create it,  1ULL < I  expression is evaluated as 64 bit

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