Error : subscripted value is neither array nor Pointer nor vector

Question

Hello, good afternoon, I’m trying to get the values that are in my matrix in the function, but this giving this problem:1:19: error: subscripted value is neither array nor Pointer nor vector

Below is the function code:

int contagemlinha(int* matriz, int N)
{
    int i, j, soma;

    for(i = 0, j = 0; j < N; j++)
    soma += matriz[i][j];

    return soma;
}

is it wrong to try to allocate in an integer of int these values?? grateful

Answer 1

The type of matriz is an integer pointer (array). In this case, when you have the operation matriz[i], the value you have is an integer. The problem is that you are trying to access the index [j] of that entire value.

You need to declare the parameter matriz as a array of arrays (or pointer pointer) to be able to access it via two indexes, as in the example below:

int contagemlinha(int ** matriz, int L, int C) {
    int i, j, soma = 0;
    for (i = 0; i < L; i++)
        for (j = 0; j < C; j++)
            soma += matrix[i][j];
    return soma;
}

Another way to store two-dimensional matrices is to store it in a simple array, with the elements of the first line followed by the elements of the second, and so on. For example, the matrix

1  2  3  4
5  6  7  8
9 10 11 12

Can be stored in the array

1  2  3  4  5  6  7  8  9 10 11 12

If that’s your case, then you just need to scroll through the matrix with an index:

int contagemlinha(int* matriz, int N)
{
    int i, soma = 0;

    for(i = 0; i < N; i++)
        soma += matriz[i];

    return soma;
}