error: no matching function for call to 'displayScreenXY' in 2D Table

Question

I'm learning c++, I'm trying to display simple table with X Y coordinates in each case. But when I build it I get this error : error: no matching function for call to 'displayScreenXY'

I tried to replace

void displayScreenXY(int **tab, int x, int y);

by

void displayScreenXY(int tab[][], int x, int y);

but I get this error : error: array has incomplete element type 'int []' void displayScreenXY(int tab[][], int x, int y);

What I am missing ? Thanks for your help.

Zoltan

#include <iostream>
using namespace std;

#define xDiv 8
#define yDiv 6


void displayScreenXY(int **tab, int x, int y);

int main(){
    int screenXY[yDiv][xDiv] = {0};

    displayScreenXY(screenXY, xDiv, yDiv);

    return 0;
}

void displayScreenXY(int **tab, int x, int y){
    for (int j = 0; j < y; ++j){
        for (int k = 0; k < x; ++k){
            std::cout << j << k << " ";
        }
        std::cout << endl;
    }
}

Does this answer your question? https://stackoverflow.com/questions/12813494/why-do-we-need-to-specify-the-column-size-when-passing-a-2d-array-as-a-parameter — 463035818_is_not_an_ai, May 12 '21 at 16:50
actually there are two issues here. Why you get an error for `int tab[][]` is explained in the q&a i linked above, but I realized it isnt a good duplicate for your question. — 463035818_is_not_an_ai, May 12 '21 at 16:52
@largest_prime_is_463035818 it's it helps me, but still doesn't work — CTRL-Z, May 12 '21 at 16:54

score 1 · Accepted Answer · answered May 12 '21 at 16:50

1

The conversion of a pointer to an array only applies to the outermost dimension of a multidimensional array. So a int [yDiv][xDiv] cannot be converted to a int **.

If you change the signature to:

void displayScreenXY(int tab[yDiv][xDiv], int x, int y);

It will work as expected.

answered May 12 '21 at 16:50

dbush

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so I did the correction and now I get : _error: no matching function for call to 'displayScreenXY'_ – CTRL-Z May 12 '21 at 16:56

error: no matching function for call to 'displayScreenXY' in 2D Table

1 Answers1