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  • INTERVIEW QUESTIONS LANGUAGES C++ DETAILS
    Question :
    Why always array starts with index 0?


    Category C++ Interview Questions
    Rating (3.0) By 2 users
    Added on 7/19/2006
    Views 1435
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    Answers:

    Array name is a constant pointer pointing to the base address(address of the first byte where the array begin) of the memory allocated. When you use arr[i], the compiler manipulates it as *(arr + i). Since arr is the address of the first element, the value of i must be 0 for accessing it. Hence all arrays begin with an index of 0.



    The compiler thinks that 0 is a positive number.
    we have an integer range of
    -128 to 127.
    here -128 to -1 are negative numbers
    and 0 to 127 are positive numbers
    so array starts with the 0 as index.



     Posted by: kishore reddy    

    Contact kishore reddy  Contact kishore reddy


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