Screensaver problem

[warcia]

Hey,i'm using visual studio 2015. The task is to get an "n" number of "X" characters on the console in random positions after that the "X" characters have to move up, down,left or right one space randomly on their own, if they get to the edge they have to come out on the opposite side and continue, it has to exit by pressing q. I'm having trouble getting them to move randomly so i would appreciate the help.

#include "stdafx.h"
#include <iostream>
#include <Windows.h>
#include <conio.h>
#include <ctime>
#include <stdio.h>




using namespace std;


void gotoxy(int x, int y)
{
    COORD c = { x, y };
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), c);
}




int main()
{
    srand(time(0));
    int n,x,y;
    char ch = 'X';
    char cha;
    int i = 0;


    
    cin >> n;


    do {
    


            while (i<n)
        {
                i++;
                x = rand() % 150;
                y = rand() % 20;
                gotoxy(x, y);
                cout << ch;


                
        }
            
    
        cha = _getch();
    } while (cha != char('q') && cha!=char('Q'));




    return 0;
}

[Salem]

You want them to move randomly.

Which means you need to know where they are.

So perhaps things along the line of

const int SCREEN_X = 150;
const int SCREEN_Y = 50;
const char SYMBOL = 'X';
const char BLANK = ' ';
class Dots {
  private:
    int x,y;
  public:
    Dots() {
        x = rand() % SCREEN_X;
        y = rand() % SCREEN_Y;
    }
    void draw() {
        gotoxy(x, y);
        cout << SYMBOL;
    }
    void undraw() {
        gotoxy(x, y);
        cout << BLANK;
    }
    void move() {
        undraw();
        x += rand() % 3 - 1;
        y += rand() % 3 - 1;
        // you fix the edge wrapping
        draw();
    }
};

[Salem]

Also here -> Screensaver problem - C++ Forum

[warcia]

Thanks for the help but i just started c++ not too long ango and we haven't even gotten to classes, so i don't know why this is the homework. Could you tell me how to do it with what you wrote cause i honestly have no idea and i'm just getting errors, would really appreciate the help.

[stahta01]

Have you covered arrays?
Have you covered structures (struct)?
Edit: Have you covered user defined functions?

Does "n" have a max value that you have to support?

Tim S.

[warcia]

Yes we covered arrays and just barely begun structures. The task just says "n" has to be an integer.

[Salem]

So create an array of

struct Dot {
  int x;
  int y;
};

[warcia]

I managed to do it with the class you sent at least in part. How would i make all of the "X"-s move, only one of them moves cause the gotoxy function is tied to the cursorposition i think at least.

#include "stdafx.h"
#include <iostream>
#include <Windows.h>
#include <conio.h>
#include <ctime>
#include <stdio.h>








using namespace std;




void gotoxy(int x, int y)
{
	COORD c = { x, y };														
	SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), c);
}




const int screen_x = 100;
const int screen_y = 30;													
const char symbol = 'X';
const char blank = ' ';
class Dots {																
private:
	int x, y;
public:
	void Random() {															
		x = rand() % screen_x;
		y = rand() % screen_y;
	}
	void draw() {															
		gotoxy(x, y);
		cout << symbol;
	}
	void undraw() {															
		gotoxy(x, y);
		cout << blank;
	}
	void move() {																
		undraw();
		x = x + rand() % 3 - 1;
		y = y + rand() % 3 - 1;
		draw();
	}
};


int main()
{


	int n;
	Dots Pontok;
	char cha;
	
	cin >> n;


	for (int i = 0; i < n; i++)												
	{
		Pontok.Random();
		Pontok.draw();	
	}


do {
	while (!_kbhit())
	{
		Pontok.move();
		Sleep(500);
	}				 																
		cha = _getch();
	} while (cha != char('q') && cha != char('Q'));
	








    return 0;
}