Rotate char array

This is a discussion on Rotate char array within the C++ Programming forums, part of the General Programming Boards category; Hello, I want to rotate an array, but I haven't had any luck yet. I want it like this: Code: ...

  1. #1
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    Rotate char array

    Hello,

    I want to rotate an array, but I haven't had any luck yet. I want it like this:

    Code:
    char array[3][4] = {'0'};
    
    array[0] = "haai";
    array[1] = "hiii";
    array[2] = "hooh";
    I want it to rotate by one, to the right, like:

    array[0] = array[1]
    array[1] = array[2]
    array[2] = array[0]

    so instead of "haaihiiihooh" you have "hiiiihoohhaai". The index of the array is different all the time, depending on the user input.

    Can someone help me with this one please?

    Thanks.

  2. #2
    The C eater *munch*
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    does that even compile?

  3. #3
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    Who cares, I just need the strings in the char array rotated.

  4. #4
    Registered User hk_mp5kpdw's Avatar
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    One of the easiest ways would be to use a vector or other STL container of string objects along with the rotate function.
    "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
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  5. #5
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    Is this what you are looking for?
    Code:
    char *  arr[3] = {"haai", "hiii", "hooh"};
    char * temp;
    
    temp = arr[2];
    arr[2] = arr[1];
    arr[1] = arr[0];
    arr[0] = temp;
    There's a number of different ways to go at your problem... could use more detail.
    Callou collei we'll code the way
    Of prime numbers and pings!

  6. #6
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    Code:
    char array[3][4] = {'0'};
    
    array[0] = "haai";
    Can you hold a string in a char? :P

    Also, your array is multi-dimentional yet you are only pointing to one dimention.

  7. #7
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    Thanks all, I got it working.

  8. #8
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    Hello again,

    I use this code to rotate the array, but I need some code to rotate it back.

    Code:
     
    string temp = "";
    temp = cBlok[iBlokAantal - 1];
    
    for (int i = (iBlokAantal - 1); i > -1; i--)
    {
    	if (i == 0)
    	{
    		for(int x = 0; x < 16; x++)
    		{
    			cBlok[i][x] = temp[x];
    		}
    	}
    	else
    	{
    		for(int x = 0; x < 16; x++)
    	        {
                              cBlok[i][x] = cBlok[i-1][x];
    		}
    	}
    }
    Can someone help me to rotate it back?

  9. #9
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    Do you understand what that code is doing? To rotate back you can do the same, but loop in the other direction and use +1 instead of -1.

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