Question

5. Ups and Downs
Write a program that displays the word UP on the bottom line of the screen a couple of
inches to the left of center and displays the word DOWN on the top line of the screen a
couple of inches to the right of center. Moving about once a second, move the word UP up
a line and the word DOWN down a line until UP disappears at the top of the screen and
DOWN disappears at the bottom of the screen.


6. Wrapping Ups and Downs
Modify the program you wrote for Programming Challenge 5, so that after disappearing
off of the screen, the word UP reappears at the bottom of the screen and the word DOWN
reappears at the top of the screen.The words should continue moving until the user presses
the [Enter] key to terminate the program

Answer 1

#include <iostream>
#include <windows.h>
using namespace std;
const int CENTER_PADDING = 5; // distance from middle to UP and DOWN
// Changes output device (in our case console) cursor position
void gotoxy(int x, int y, HANDLE outputDeviceHandle);
// Prints word in output device (console) on specified cursor position
void printWordOnConsole(HANDLE outputDeviceHandle, int x, int y, char* word);
void main()
{
    HANDLE consoleHandle = GetStdHandle(STD_OUTPUT_HANDLE);
    CONSOLE_SCREEN_BUFFER_INFO csbi; // structure where we write console window size
    GetConsoleScreenBufferInfo(consoleHandle, &csbi); // and other information
    int consoleColumns = csbi.srWindow.Right - csbi.srWindow.Left + 1; // get console length
    int consoleRows = csbi.srWindow.Bottom - csbi.srWindow.Top + 1; // get console width
    int middleColumn = consoleColumns / 2;
    // move "UP" and "DOWN" words until they go to top and bottom
    for (int i = 0, j = consoleRows - 1; j >= 0; i++, j--)
    {
        printWordOnConsole(consoleHandle, middleColumn - CENTER_PADDING, j, "UP");
        printWordOnConsole(consoleHandle, middleColumn + CENTER_PADDING, i, "DOWN");
        Sleep(1000);
        system("cls");
    }
}
void printWordOnConsole(HANDLE outputDeviceHandle, int x, int y, char* word)
{
    gotoxy(x, y, outputDeviceHandle);
    cout << word;
}
void gotoxy(int x, int y, HANDLE outputDeviceHandle)
{
    COORD coord;
    coord.X = x;
    coord.Y = y;
    SetConsoleCursorPosition(outputDeviceHandle, coord);
}
#include <iostream>
#include <conio.h> // for getch()
#include <windows.h>
using namespace std;
const int CENTER_PADDING = 5;
// Changes output device (in our case console) cursor position
void gotoxy(int x, int y, HANDLE outputDeviceHandle);
// Prints word in output device (console) on specified cursor position
void printWordOnConsole(HANDLE outputDeviceHandle, int x, int y, char* word);
// Deletes word with specified length from specified position on output device (console)
void deleteWordFromConsole(HANDLE outputDeviceHandle, int x, int y, int length);
// Thread function that prints "UP" and "DOWN"
DWORD WINAPI upAndDownPrintingLoop(LPVOID continuePrinting);
void main()
{
    cout << "Press [Enter] key to stop printing...";
    bool keepPrinting = true;
    HANDLE hThread = CreateThread(NULL, 0, upAndDownPrintingLoop, &keepPrinting, 0, NULL);
    while (getch() != 13)
    {
    }
    keepPrinting = false;
    CloseHandle(hThread);
}
DWORD WINAPI upAndDownPrintingLoop(LPVOID continuePrinting)
{
    bool* keepPrinting = (bool*)continuePrinting;
    HANDLE consoleHandle = GetStdHandle(STD_OUTPUT_HANDLE);
    CONSOLE_SCREEN_BUFFER_INFO csbi;
    GetConsoleScreenBufferInfo(consoleHandle, &csbi);
    int consoleColumns = csbi.srWindow.Right - csbi.srWindow.Left + 1;
    int consoleRows = csbi.srWindow.Bottom - csbi.srWindow.Top + 1;
    int middleColumn = consoleColumns / 2;
    while (*keepPrinting)
    {
        for (int i = 0, j = consoleRows - 1; j >= 0 && *keepPrinting; i++, j--)
        {
            printWordOnConsole(consoleHandle, middleColumn - CENTER_PADDING, j, "UP");
            printWordOnConsole(consoleHandle, middleColumn + CENTER_PADDING, i, "DOWN");
            Sleep(700);
            deleteWordFromConsole(consoleHandle, middleColumn - CENTER_PADDING, j, 2);
            deleteWordFromConsole(consoleHandle, middleColumn + CENTER_PADDING, i, 4);
        }
    }
    return 0;
}
void printWordOnConsole(HANDLE outputDeviceHandle, int x, int y, char* word)
{
    gotoxy(x, y, outputDeviceHandle);
    cout << word;
}
void deleteWordFromConsole(HANDLE outputDeviceHandle, int x, int y, int length)
{
    gotoxy(x, y, outputDeviceHandle);
    // cout << string(length, '\b').c_str();
    cout << string(length, ' ').c_str();
}
void gotoxy(int x, int y, HANDLE outputDeviceHandle)
{
    COORD coord;
    coord.X = x;
    coord.Y = y;
    SetConsoleCursorPosition(outputDeviceHandle, coord);
}