Consider the following code (tetris-1a.exe), which shows a space with different color, when the user press '1', '2', '3', ..., '7'.

#include <iostream>
#include <curses.h>
#include "wincursor.h"

int main()
{
    char i, c;
    Screen myScreen;
    String sp(" ", 10, 10);
    String v(myScreen.version(), 11, 10);

    for (i=0; i<=7; i++)
    {
        sp.show(i+1, 40, i);
    }
    v.show();
    myScreen.redraw();

    while ( (c = myScreen.key() ) != 'q')
    {
        if ('0' <= c && c <= '7')
        {
            i = c - '0';
            sp.show(10, 10, i);
            myScreen.redraw();
        }
    }

    return 0;
}

Extend this program so that it will use different colors to show a TETRIS tetromino, which is a geometric shape composed of four squares block, when you press a key '1', '2', ..., '7'. (tetris-1c.exe)