perl - Please explain me what is hapenning in line 3 of this code -


Please tell me what is happening in the 3 line of this code. 

  For my $ I (0 .. $ dim) {my $ j (0 .. $ dim) {$ adj-> [$ i] [$ j] = $ adj- & Gt; [$ I] for [$ j]? [$ J]: [];  
 
 Code loop  $ adj . Possibly,  $ dim  is a dimension, and iterate over the list of numbers from  $ i  and  $ j  to  0  For  $ dim , for example  0,1,2,3,4,5 . 
 
 For each combination of numbers, the value of that array element is checked for the accuracy, and it is assigned a new value. If the value is false, then this index is assigned to an array referee with  $ j , otherwise the empty table  [] . 
 
 The conditional operator is used here with the original syntax 
 
  condition? FOO: BAR If the condition is then FOO AND BAR  
 
 Probably, array reference should be array reference in  $ adj , which is why it is only true Can check  defined $ adj-> As a shortcut for [$ i] [$ j]

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