array problem

This is a discussion on array problem within the C++ Programming forums, part of the General Programming Boards category; I found it useless to do something on array such as if(myArray=[1,2,3]) , and the only way I figure out ...

  1. #1
    flashing vampire black's Avatar
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    May 2002
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    563

    array problem

    I found it useless to do something on array such as if(myArray=[1,2,3]), and the only way I figure out is to compare the elements in each array separately just like this:

    for(i=0; i<3; i++)
    {
    if(myArray[i]==myVar)
    {
    doThis();
    }
    }


    is there any other way conveniently ?
    Never end on learning~

  2. #2
    Registered User moonwalker's Avatar
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    I dont think so

    Unfortunately, I dont think you can do that for integer arrays.

    However, you can compare char arrays using

    strcmp(array1, array2)

    This is how I think you can compare integer arrays
    PHP Code:
    int flag 0;
    int myArray = {1,2,3}
    int myVar = {1,2,3};

    for(
    i=0i<3i++) 

          if(
    myArray[i]==myVar[i]) 
          {
                  
    flag++;
          }

    so if flag = 3, it means all elements are the same.

  3. #3
    flashing vampire black's Avatar
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    sorry, forgot to mention myVar was a variable itself.

    and I just want figure out how could we do something like this:
    if(myArray==[1,2,3]).

    thanx in advance~
    Never end on learning~

  4. #4
    Registered User moonwalker's Avatar
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    not possible

    to the best of my knowledge, i dont think you can do that directly.

    why dont you try making a function yourself... just like strcmp
    call it

    intarraycmp(int *array1, int *array2)

    it should return 0 if there are no differences, and 1 if there's
    atleast one difference.

    Use the same logic as I did in my previous post.

  5. #5
    Registered User
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    Moonwalker is correct because 'myArray' acts as a pointer to the first location (zero-position) of the array.

    Without incrementing the pointer, as with the FOR loop that was shown, it will simply sit at the first array position. Good for comparing that value, but not very handy for comparing the remainder of the array.

    The function idea is a good one.

    -Skipper
    "When the only tool you own is a hammer, every problem begins to resemble a nail." Abraham Maslow

  6. #6
    flashing vampire black's Avatar
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    thanx guys~ I'll do better with array.
    Never end on learning~

  7. #7
    Basementman
    Guest

    Post array comparison

    If you have two array pointers to int arrays, and both arrays have a fixed size which is known, why not just do this:

    BOOL CompareIntArrays(int *ipArray1, int *ipArray2, int iArraySize)
    {
    return (memcmp(ipArray1, ipArray2, iArraySize * sizeof(int)) == 0);
    )

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