Need help creating a grid

[aphelia]

Hi. I am barely new to C++.

Right now I am trying to make a 9X9 grid that fills @ # $ % randomly.

I wrote down some codes, but I am constantly getting error LNK2019 and LNK1120.

How can I deal with this?

Here is the code that I wrote.

  #include <iostream>
#include <string.h>
#include <windows.h>

using namespace std;

	void drawGrid(char grid[9][9])
	{
		cout << " " << grid[0][0] << " | " << grid[0][1] << " | " << grid[0][2] << " | " << grid[0][3] << " | " << grid[0][4] << " | " << grid[0][5] << " | " << grid[0][6] << " | " << grid[0][7] << " | " << grid[0][8] << endl;
		cout << "---|---|---|---|---|---|---|---|---\n";
		cout << " " << grid[0][0] << " | " << grid[1][1] << " | " << grid[1][2] << " | " << grid[1][3] << " | " << grid[1][4] << " | " << grid[1][5] << " | " << grid[1][6] << " | " << grid[1][7] << " | " << grid[1][8] << endl;
		cout << "---|---|---|---|---|---|---|---|---\n";
		cout << " " << grid[0][0] << " | " << grid[2][1] << " | " << grid[2][2] << " | " << grid[2][3] << " | " << grid[2][4] << " | " << grid[2][5] << " | " << grid[2][6] << " | " << grid[2][7] << " | " << grid[2][8] << endl;
		cout << "---|---|---|---|---|---|---|---|---\n";
		cout << " " << grid[0][0] << " | " << grid[3][1] << " | " << grid[3][2] << " | " << grid[3][3] << " | " << grid[3][4] << " | " << grid[3][5] << " | " << grid[3][6] << " | " << grid[3][7] << " | " << grid[3][8] << endl;
		cout << "---|---|---|---|---|---|---|---|---\n";
		cout << " " << grid[4][0] << " | " << grid[4][1] << " | " << grid[4][2] << " | " << grid[4][3] << " | " << grid[4][4] << " | " << grid[4][5] << " | " << grid[4][6] << " | " << grid[4][7] << " | " << grid[4][8] << endl;
		cout << "---|---|---|---|---|---|---|---|---\n";
		cout << " " << grid[5][0] << " | " << grid[5][1] << " | " << grid[5][2] << " | " << grid[5][3] << " | " << grid[5][4] << " | " << grid[5][5] << " | " << grid[5][6] << " | " << grid[5][7] << " | " << grid[5][8] << endl;
		cout << "---|---|---|---|---|---|---|---|---\n";
		cout << " " << grid[6][0] << " | " << grid[6][1] << " | " << grid[6][2] << " | " << grid[6][3] << " | " << grid[6][4] << " | " << grid[6][5] << " | " << grid[6][6] << " | " << grid[6][7] << " | " << grid[6][8] << endl;
		cout << "---|---|---|---|---|---|---|---|---\n";
		cout << " " << grid[7][0] << " | " << grid[7][1] << " | " << grid[7][2] << " | " << grid[7][3] << " | " << grid[7][4] << " | " << grid[7][5] << " | " << grid[7][6] << " | " << grid[7][7] << " | " << grid[7][8] << endl;
		cout << "---|---|---|---|---|---|---|---|---\n";
		cout << " " << grid[8][0] << " | " << grid[8][1] << " | " << grid[8][2] << " | " << grid[8][3] << " | " << grid[8][4] << " | " << grid[8][5] << " | " << grid[8][6] << " | " << grid[8][7] << " | " << grid[8][8] << endl;
	}

	void randomFill(char grid[9][9], int j, int i)
	{
		for (int i = 0; i < 9; i++)
		{
			for (int j = 0; j < 9; j++)
			{
				grid[i][j] = ((rand() % 4) == 0) ? '@' : '#'; '$'; '%';
			}
		}
		drawGrid(grid);
	}

[Chervil]

Your code has no main() function.

Program execution starts at main(), it must be present.
within main you can then call your other functions as required.

[aphelia]

Thank you for the reply.

After uploading this question, I have noticed that the code has no main function.

I edited the code, but now it does not give me the 4 characters... It only gives me 2 @ and #.

int main()
{
char grid[9][9];
for (int i = 0; i < 9; i++)
{
for (int j = 0; j < 9; j++)
{
grid[i][j] = ((rand() % 4) == 0) ? '@': '#'; '$'; '%';
}
}
drawGrid(grid);


return 0;
}


How can I fix this?

[Chervil]

This line:

    grid[i][j] = ((rand() % 4) == 0) ? '@': '#'; '$'; '%';

.. well actually it is three lines:

    grid[i][j] = ((rand() % 4) == 0) ? '@': '#';  // choose @ or #
    '$';        // do nothing
    '%';        // do nothing 

... is selecting from the two possible choices.
Remember, the ? operator in this syntax is simply a concise way to write an if/else statement, that's why it gives an either/or choice.


Instead I'd suggest something like this:

    char fill[] = "@#$%";             // list of possible characters 
    int len = strlen(fill);           // count how many characters 

    for (int i = 0; i < 9; i++)
    {
        for (int j = 0; j < 9; j++)
        {
            grid[i][j] =  fill[rand() % len];   // choose one of characters
        }
    }