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Home/ Questions/Can I fix the “c++ expression must have a constant value” or not?
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Lyra Lee
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Lyra Lee
Asked: May 18, 20222022-05-18T20:59:42+00:00 2022-05-18T20:59:42+00:00In: cpp

Can I fix the “c++ expression must have a constant value” or not?

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I’m building a new program, but when I run it, an error pops up. The error displayed is as follows:

expression must have a constant value

I have tried several workarounds, but they still do not get the desired results. If you have come across this situation and have a solution for the “c++ expression must have a constant value” problem, pls let me know. Here is what I do:

int row = 8;
 int col= 8;
 int [row][col];

Thanks!

c++ expression must have a constant value
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    lyytutoria Expert
    2022-06-24T16:27:13+00:00Added an answer on June 24, 2022 at 4:27 pm

    The cause:

    I found that you attempted to set size of an array to values which are not constant. However, C++ does not accept these non-constant values, so the error: ”c++ expression must have a constant value” happens.

    Solution:

    Let’s follow this simple way to fix your error:

    const int row = 8;
    const int col= 8;
    int a[row][col];

    UPD: You can actually accomplish this with some compilers. I believe g++ contains this function, but you should not use it because your code will not be movable to the other compilers.

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  2. Juliette Gomes
    2022-05-25T21:12:20+00:00Added an answer on May 25, 2022 at 9:12 pm

    An array such as this must have a constant size. You will need to allocate memory on the heap to create a dynamic array. After you are done, you can also free it with delete

    //allocate the array
    int** arr = new int*[row];
    for(int i = 0; i < row; i++)
     arr[i] = new int[col];
    
    // use the array
    
    //deallocate the array
    for(int i = 0; i < row; i++)
     delete[] arr[i];
    delete[] arr;

    You must declare const.

    const int row = 8;
    const int col = 8;
    int arr[row][col];

    Also,

    int [row][col];

    does not even include a variable name.

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