Question

Im trying to create a program that shows a character matrix 10×10, and shows a character in it, and in every 600 miliseconds the character would move randomly. But my problem is that everytime i run the program, it is the same movement.

If you look at the function Random_move i used the function Rand()… i also tried with srand(time(null)); before, but that only makes both characters, a and b, to move always in the same direction. Can someone please help.

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

class mapa
{
    private :
    char map[10][10];
    char background[10][10];
    public :
    mapa();
    void cpy_btom();
    void copy_to_map(int, int, char);
    void print();
};
class character
{
    private :
    int posx;
    int posy;
    char type;
    public :
    character(char,int,int);
    void send_print(mapa &);
    void random_move(mapa &);
    void delay(int);
};

int main()
{
    character C1('A', 5, 5);
    character C2('B', 8, 2);
    mapa Mapa;
    while(!GetAsyncKeyState(VK_ESCAPE))
    {
        Mapa.print();

        C1.delay(750);

        C1.random_move(Mapa);
        C2.random_move(Mapa);
    }
}

void mapa :: cpy_btom()
{
    for(int a = 0;a < 10;a++)
    {
        for(int b = 0;b<10;b++)
        {
            map[a][b] = background[a][b];
        }
    }
}
void mapa :: print()
{
    system("cls");

    for(int a = 0;a<10;a++)
    {
        for(int b = 0;b<10;b++)
        {
            cout << map[a][b];
        }
        cout << endl;
    }
    cpy_btom();
}
character :: character(char kind = 'a', int x = 5, int y = 5)
{
    type = kind;
    posx = x;
    posy = y;
}
void character :: send_print(mapa & mapa)
{
    mapa.copy_to_map(posx, posy, type);
}

void character :: random_move(mapa & MAP)
{

    int a = rand() % 5;
    int b = rand() % 50;
    if(a == 0) //x --
    {
        if(b < 45)
        {
            if(posx > 0)
                posx--;
        }
        else
        {
            if(posx > 1)
            posx = posx - 2;
        }
    }
    else if(a == 1)
    {
        if(b < 45)
        {
            if(posx < 10)
            posx++;

        }
        else
        {
            if(posx < 9)
            posx = posx + 2;
        }
    }
    else if(a == 2)
    {
        if(b < 45)
        {
            if(posy > 0)
            posy--;
        }
        else
        {
            if (posy > 1)
            posy = posy - 2;
        }
    }
    else if(a == 3)
    {
        if(b < 45)
        {
            if(posy < 10)
            posy++;
        }
        else
        {
            if(posy < 9)
            posy = posy + 2;
        }
    }
    send_print(MAP);
}

void character :: delay(int time)
{
    int a = clock();
    int b = clock() + time;
    while(a < b)
    {
        a = clock();
    }
}
mapa :: mapa()
{
    for(int a = 0;a < 10;a++)
    {
        for(int b = 0;b < 10;b++)
        {
            map[a][b] = ' ';
            background[a][b] = ' ';
        }
    }
}

void mapa :: copy_to_map(int x, int y, char kind)
{
    map[x][y] = kind;
}

Answer 1

Try calling srand(time(0)) in the beginning of your main.