insert a value into an array! Help

This is a discussion on insert a value into an array! Help within the C++ Programming forums, part of the General Programming Boards category; For example: a[6]={1, 2, 3, 4, 5, 6}. I want to insert value 7 into a[2] this array.so the output ...

  1. #1
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    insert a value into an array! Help

    For example: a[6]={1, 2, 3, 4, 5, 6}. I want to insert value 7 into a[2] this array.so the output 1, 2, 7, 3, 4, 5. I write a free function like this

    void insert(int a[], int &size, int pos, int number)
    {

    int i;


    for(i=pos;i<size; i++)
    {
    a[i+1]=a[i];
    }
    a[pos]=number;
    }
    Can you correct function for me? I got uncorrectly output.
    1,2,7,3,3,3,

  2. #2
    vae victus! skorman00's Avatar
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    the statement within the for loop should be flipped. Follow it through using your own numbers, and you'll see that you are setting the next position to the position behind you.

    You may also need to change the condition of your for loop to stop you from going out of bounds of the array depending and what you pas in as size.

  3. #3
    Carnivore ('-'v) Hunter2's Avatar
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    2,879
    Try passing an int* instead of int[], though I don't know if that's the problem. Also, if size is the size of the array, that might be another problem: a[i + 1] = a[i]. Since i goes up to (size - 1), i + 1 will eventually be (size), which should give an array index out of bounds. Try those and see if it helps

    **EDIT**
    Oops, good point skorman. The for loop should iterate backwards (go from (size - 1) to pos) if you want it to work.
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  4. #4
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    Thanks, Hunter and Skorman00

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