Question

i had a question in my program. When I pass the 3D int array CodedGreen to the function Green_Decode_Tree. An error message”invalid use of array with unspecified bounds” displayed. What is the mistake in my program? Thanks for your help.

for(i=0;i<256;i++){
          for(j=0;j<256;j++){
    Decode_Tree(green[0], CodedGreen,0,i,j);
          }
      }

void Green_Decode_Tree(node* tree, int code[][][], int num,int row,int col)
{
    int i;
    i=num;

    if((tree->left == NULL) && (tree->right == NULL)){
        fprintf(DecodGreen,"%s\n", tree->ch);
    }
    else
    {
        if(code[row][col][num]==1){
            i++;
            Green_Decode_Tree(tree->left,code,i,row,col);
        }
        else if (code[row][col][num]==0){
            i++;
            Green_Decode_Tree(tree->right,code,i,row,col);
        }

    }

}

Answer 1

i will reveal you a secret. 2d (and 3d) arrays are represented as liner memory arrays. when you have array NxM and access it like a[i][j] it is actually translated to a[i*M + j] as you might notice compiler must know M here to do this conversion, otherwise it will not be able to translate it. So thats what he asks. You must provide all except first sizes in array: int code[][M][N]