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Doubt on Arrays

sanyasirao nali
Greenhorn

Joined: Oct 14, 2012
Posts: 6

Why arrays are started with 0(zero) index...?

example: a[5]={23,5,34,23,21}
here a[0]=23,a[1]=5 . . . . . . ,a[4]=21.
here a[] started with a[0] not a[1]......why arrays are starting with 0(zero) index...?



Thankyou in Advance.
dennis deems
Ranch Hand

Joined: Mar 12, 2011
Posts: 808
An array is not merely a logical structure; it is a contiguous chunk of memory space. What makes using arrays so blindingly fast is that we can get any array element by applying an offset ( the index number ) to the start of the array. To get the first array element, we go to the start of the array and apply an offset of zero. To get the fifth element we go to the start of the array and apply an offset of four.
Tony Docherty
Bartender

Joined: Aug 07, 2007
Posts: 2359
    
  50
Why arrays are started with 0(zero) index...?

Arrays in Java start at 0 but not all languages take this approach.
See this thread for an explanation: http://www.coderanch.com/t/384946/java/java/starting-index-array
 
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subject: Doubt on Arrays