Perl array element manipulation -

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I was trying and trying with this one, but it just does not seem to be the click if I have a Array, then say 6 numbers: 

  @ a = (1,2,3,4,5,6)   
     
  1.  
     How do I get every other index (2, 4, 6) in this matter?   
  2.  
     How do I calculate the difference of every two elements, then the output will be here:    
     
     1 1 1 (because 2-1 = 1 and 4-3 = 1 and so on ..)   $ a  or  $ b , they are special (< Code> sorting  using them ...) ... is usually better for giving your variable a descriptive name, letting it know as to what kind of variable it is   (my $ index = 0; $ index

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