ISO C++ forbids comparison between pointer and integer [-fpermissive] 2d array

Question

I want to check if 2d array is equal to int variable but the problem "ISO C++ forbids comparison between pointer and integer [-fpermissive]" shows up.

#include <bits/stdc++.h>
using namespace std;

const int height = 50;
int stone = 1;
int dot = 2;
int blank = 0;

void draw(int x, int t)
{
    int width = x;
    int board[height][width];

    for(int i=0;i<width;i++)
    {
        board[i][0]=blank;
    }
    
    board[t][0]=dot;

    for(int y=0;y<height;y++)
    {
        for(int j=0;j++;j<width)
        {
            if(board[y][j-1]==dot && board[y][j+1]==blank)
            {
                board[y+1][j-1]=stone;
                board[y+1][j+1]=stone;
            }
            
            else 
            {
                board[y+1][j]==board[y][j];
            }
            cout<<board[y+1][j];
        }
    cout << endl;
    }
}

I dont really know what to do edit: here is full code.

note that this line `board[y+1][j]==board[y][j];` does nothing — pm100, Nov 19 '22 at 18:51
my guess - this is not the code you are compiling. You somehow are compiling the wrong file — pm100, Nov 19 '22 at 18:52
also note that a) never include bits/xxxx, B) that variable length array is non standard c++ — pm100, Nov 19 '22 at 18:53
It's good that you quoted the error message, but you really need to say which line of code it applies to, because it's not obvious. — john, Nov 19 '22 at 19:24
[Why should I not #include ?](https://stackoverflow.com/questions/31816095/why-should-i-not-include-bits-stdc-h) — Jesper Juhl, Nov 19 '22 at 19:52

score 1 · Answer 1 · answered Nov 19 '22 at 18:34

1

Code as below compiles for me, so error is somewhere else.

int board[3][4];

int dot = 2;
int blank = 0;

int main()
{
    int y = 1;
    int j = 1;
    if(board[y][j-1]==dot && board[y][j+1]==blank)
        ;
}

You need to show more.

answered Nov 19 '22 at 18:34

Maciej Polański

373
1
7

I added full code – blobaben Nov 19 '22 at 18:46
The code you added compiles correctly, however it lacks `main()` function: https://godbolt.org/z/EGMr16dYz If there is an error, it is probably in main. – Maciej Polański Nov 19 '22 at 18:49

ISO C++ forbids comparison between pointer and integer [-fpermissive] 2d array

1 Answers1