Need help with a maze game project

[c4l]

I have been working on this maze game for a while, but it seems like my maze.go function isn't working properly.

#include <iostream>
using namespace std;

int i, j;

int return0h (int a, int b, int **p) {
    for (i = 0; i < a; i++) {
        for (j = 0; j < b; j++) {
            if (p[i][j]==0) return i;
        }
    }
}

int return0v (int a, int b, int **p) {
    for (i = 0; i < a; i++) {
        for (j = 0; j < b; j++) {
            if (p[i][j]==0) return j;
        }
    }
}

class maze {
    public:
        void print() const;
        void go(string dir);
        maze();
        maze(int x, int y, int **p);
        bool isCompleted();
        void reset();
    private:
        bool prIsCompleted;
        int length;
        int width;
        int **d;
        int **dr;
        int moves;
};

maze::maze () {
    length = 3;
    width = 3;
    d = new int *[3];
    d[0] = new int[3];
    d[1] = new int[3];
    d[2] = new int[3];
    d[0][0]=0;
    d[0][1]=1;
    d[0][2]=2;
    d[1][0]=2;
    d[1][1]=1;
    d[1][2]=2;
    d[2][0]=2;
    d[2][1]=1;
    d[2][2]=3;
    moves = 0;
    prIsCompleted=0;
    dr=d;
}

maze::maze (int x, int y, int **p) {
    length = x;
    width = y;
    d = p;
    moves = 0;
    prIsCompleted=0;
    dr=d;
}

void maze::print() const {
    int c = 0;
    for (i = 0; i < length; i++) {
        for (j = 0; j < width; j++) {
            cout << d[i][j] << " ";
            c++;
            if (c == length) {
                c = 0;
                cout << endl;
            }
        }
    }
    cout << "\nMoves: " << moves << endl;
}

void maze::go (string dir) {
    int x, y;

    x = return0h(length, width, d);
    y = return0v(length, width, d);

    if (!prIsCompleted) {

        if (dir=="LEFT" && d[x-1][y]==1) {
            if (d[x-1][y]==3) {
                cout << "Congratulations, maze completed!\n";
                prIsCompleted = 1;
            }

            d[x-1][y]==0;
            d[x][y]==1;
            moves++;
        }

        else if (dir=="RIGHT" && d[x+1][y]==1) {
            if (d[x+1][y]==3) {
                cout << "Congratulations, maze completed!\n";
                prIsCompleted = 1;
            }

            d[x+1][y]==0;
            d[x][y]==1;
            moves++;
        }

        else if (dir=="UP" && d[x][y+1]==1) {
            if (d[x][y+1]==3) {
                cout << "Congratulations, maze completed!\n";
                prIsCompleted = 1;
            }

            d[x][y+1]==0;
            d[x][y]==1;
            moves++;
        }

        else if (dir=="DOWN" && d[x][y-1]==1) {
            if (d[x][y-1]==3) {
                cout << "Congratulations, maze completed!\n";
                prIsCompleted = 1;
            }

            d[x][y-1]==0;
            d[x][y]==1;
            moves++;
        }

        else if (dir=="DOWN" || dir=="UP" || dir=="LEFT" || dir =="RIGHT") cout << "Invalid move!" << endl;
        else cout << "Invalid direction, use LEFT, RIGHT, UP or DOWN to navigate through the maze" << endl;
    }
    else cout << "Can't move because maze is completed\n";
}

bool maze::isCompleted() {
    if (prIsCompleted==1) return 1;
    else return 0;
}

void maze::reset() {
    moves=0;
    d = dr;
}


int main () {
    /* int a, b;

    cout << "Enter maze length and width" << endl;
    cin >> a >> b;

    int **p;

    p = new int *[a];

    for (i = 0; i < a; i++) {
        p[i] = new int[b];
    }

    for (i = 0; i < a; i++) {
        for (j = 0; j < b; j++) {
            cout << "Entering element [" << i+1 << "][" << j+1 <<  "]" << endl;
            cin >> p[i][j];
        }
    } */

    string direction;
    maze m;
    while (!m.isCompleted()) {
        m.print();
        cout << endl;
        cout << "Where do you want to move?\n";
        cin >> direction;
        cout << endl;
        m.go(direction);
    }

}

If 0 is in the top left corner, and to navigate you have to go RIGHT (default), if you go LEFT it causes a run time error, if you go RIGHT it says Invalid move!, and if you go UP, it will add 1 to the moves counter, but nothing else would happen. Also, if someone can help me create a function that would make a random maze, that would be nice (or article that might help me with this).

[Codermik]

Lines 98/99 you are using == instead of =, same with 109, 110,120, 121, 131, and 132.

There may be other issues but those stand out.

[c4l]

Fixed it, still same errors.

[AbstractionAnon]

Line 12: What does return0h return if none of the cells are 0?
Line 20: ditto

Lines 46-54: What do these values mean? You have no comments. You should consider using a enum here. Not providing a comment or using an enum makes your code hard toread.

Line 109,110,120,121,131,132: You've edited your original post, but the code still shows you're using the wrong operator. These should be an assignment (=), not an equality operator (==).

Lines 25,84: You trying to use std::string, but haven't included the <string> header.

if you go LEFT it causes a run time error

Well, yeah. You're indexing out of bounds.
Line 93,98: What happens when x is 0? These statements become

 
  if (d[-1][y]
...
  d[-1][y] = 0;

Both are illegal references.

You have this problem in all four directions.

Lines 56,65,95,106,117,128: You're setting prIsCompleted to an int value. That's legal, but the better practice is to use the bool constants true and false.

Lines 142-145: maze::isCompleted does not need an if statement. Simply return the bool variable.

bool maze::isCompleted() 
{   return prIsCompleted; 
}