2D arrays and Coordinates

I'm trying to just print space in my "canvas" ( with coordinates (2,2) for example) by editing my 80x20 grid made by █ blocks in the console window.

• Please suggest me better ways of creating the grid in the first place ( I've just learned for-each loops)

• Why do I get those 3 characters after running the program ?

• Why isn't the space on the (2,2) block but obviously on the first row somewhere in the mid ?

Code :

#include <iostream>

int main()
{
 uint8_t block {219}; // █
 uint8_t space {32};  // ' '

 uint8_t screen[80][20] {};

 for (auto &row : screen)   // make the "canvas"
    for (auto &col : row)
        col = block;

 for (int row = 1; row <= 80; ++row)
 {
    for (int col = 1; col <= 20; ++col)
    {
        if (col == 2 && row == 2)
            screen[row][col] = space;

    }
 }


std::cout << *screen;

return 0;
}