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.

Solutions

Verified

Solution A

Solution B

Answered 7 months ago

Step 1

1 of 4

This program exercise uses windows.h library to display "animation". We start by importing required libraries and declaring a namespace.

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

using namespace std;

First we set word UP on the bottom line of the screen a couple of inches to the left of center.

int main()
{
  //Declaration of HANDLE variable
	   HANDLE screen = GetStdHandle(STD_OUTPUT_HANDLE);

  //Start position of UP word
	   COORD posUp = {40, 50}; 
	   SetConsoleCursorPosition(screen, posUp);	
	   cout <<"UP"<< endl;
   Sleep(500);

Now we create an animation using a while loop until UP reaches top of the screen.

while (posUp.Y > 1) 
	{
		  // Erase characters at current position
		  // Move UP up one position, then pause
		  SetConsoleCursorPosition(screen, posUp);
		  cout << "  " << endl;
		  posUp.Y--;
		
		  SetConsoleCursorPosition(screen, posUp) ;
		  cout << "UP" << endl;
		  Sleep(1000) ; //sleep for one second
	}

Next, we are repeating the procedure for word DOWN. Only difference is the direction on Y axis

	COORD posDown = {70, 5}; // Start position of DOWN
	SetConsoleCursorPosition(screen, posDown);	
	cout <<"DOWN"<< endl;
	Sleep(500);
	

while(posDown.Y< 50)
	{
		   SetConsoleCursorPosition(screen, posDown) ;
		   cout << "    " << endl;
		   posDown.Y++;

		   SetConsoleCursorPosition(screen, posDown);
		   cout << "DOWN" << endl;
		   Sleep(1000);		
	}}

Answered 7 months ago

#include <iostream>
#include <windows.h>
using namespace std;

void placeCursor(HANDLE, int, int);

int main()
{
    /*--------output formatting variables------------*/
    HANDLE screen = GetStdHandle(STD_OUTPUT_HANDLE);
    int rowUp = 25;
    int rowDown = 0;
    string up = "UP";
    string down = "DOWN";

    do
    {
        placeCursor(screen, rowUp, 5);
        cout << up << endl;
        placeCursor(screen, rowDown, 5);
        cout << down << endl;
        rowUp--;        //decrementing the row so the UP can go down
        rowDown++;      //incrementing the row so the DOWN can go up
        Sleep(100);     //the screen output stops for 100 ms
        system("cls"); //clears screen in each iteration
    } while (rowUp > 0 && rowDown < 26);    //when the rows are out of range
                                            //the loop stops
    return 0;
}

void placeCursor(HANDLE screen, int row, int col)
{
    COORD position;
    position.Y = row;
    position.X = col;
    SetConsoleCursorPosition(screen, position);
}

A typical text screen has 25 rows, or lines, with 80 print positions per row. The rows range from 0 to 24, with 0 being the top row of the screen. The print positions on each row, usually referred to as columns, range from 0 to 79, with 0 being at the far left-hand side. The row and column of a cell, which identifies its location on the screen, are called its coordinates.

In the code above, we have declared two variables for $rowUP$ and $rowDOWN$ which are used for changing the positions of the words vertically.