函数矩阵中的麻烦

Question

I want to pass a matrix into a function and then return the same matrix to another function. This is part of my code:

int** inizializzazione_matrice(int matrice1[][MAX_COLONNE]){
int i = 0, k = 0;

while(i < MAX_RIGHE){
    k = 0;
    while(k < MAX_COLONNE){
        matrice1[i][k] = i;
        k++;
    }
    i++;
}

return matrice1;}

I call this function like that:

stampa_matrice(inizializzazione_matrice(matrice1));

stampa_matrice is a void function that takes the same input of inizializzazione_matrice as argument.

Their declarations are:

int** inizializzazione_matrice(int matrice1[][MAX_COLONNE]);
void stampa_matrice(int matrice1[][MAX_COLONNE]);

The error comes out at the inizializzazione_matrice return matrice1; with the error code: int (*matrice1)[10] Error type value doesn't match the function type .

I don't understand why, since the call of inizializzazione_matrice has been done in the same way and it works. I tried using the double pointer as argument too, but it's the same and i have an older code in eclipse that works just fine in the same way (that's the scary part). Am i missing something? If you need further infos please tell me!

Answer 1

You can do it in a simpler way:

void inizializzazione_matrice(int **matrice1, max_righe, max_colonne)
{
  int i = 0, k = 0;

  while (i < max_righe) {
    k = 0;
    while (k < max_colonne) {
      matrice1[i][k] = i;
      k++;
    }
    i++;
  }
}

No need to return matrice1 , as it is passed by parameter (not by value).

You can do it better (code speaking) with two nested for :

void inizializzazione_matrice(int **matrice1, max_righe, max_colonne)
{
  for (int i = 0; i < max_righe)
    for (int k = 0; k < max_colonne)
      matrice1[i][k] = i;
}