Brick game in graphics.h

Hi. First of all I want to apologize for my bad English.
I want to do a C++ brick game using graphics.h library.
I am getting 2 errors saying that 2 of my functions were not decleared in this scope.

 //This is main.cpp
#include <iostream>
#include <graphics.h>
#include "cerc.h"
#include "playerBrick.h"
#include "bricks.h"
#include "ball.h"
#include <cmath>
using namespace std;

int main()
{
    cout<<"Press esc to close the graph!";
    char ch;
    //delay(3000);
    initwindow(1500,700);
    //cerc co;
    ball ballObj;
    playerBrick bo;
    bricks bObj;
    while(1)
    {
        ch=getch();
        if((int)ch==97)
            bo.moveLeft();
        else
            if((int)ch==100)
                bo.moveRight();
            else
                if((int)ch==27)
                {
                    closegraph();
                    cout<<"Graph closed!";
                }
    }
    return 0;
}
//playerBrick.h
#ifndef PLAYERBRICK_H
#define PLAYERBRICK_H


class playerBrick
{
    friend class ball;
    public:
        playerBrick();
        void moveLeft();
        void moveRight();
        void clean();
        bool exist(double x1, double y1, double x2, double y2);
    private:
        double x1,y1,x2,y2;
};

#endif // PLAYERBRICK_H
//playerBrrick.cpp
#include "playerBrick.h"
#include <iostream>
#include <graphics.h>

using namespace std;

playerBrick::playerBrick()
{
    setcolor(GREEN);
    rectangle(500,600,1000,700);
    x1=500;
    y1=600;
    x2=1000;
    y2=700;
}

void playerBrick::moveLeft()
{
    if(exist(x1-10,y1,x2-10,y2)==1)
    {
        clean();
        x1-=10;
        x2-=10;
        setcolor(GREEN);
        rectangle(x1,y1,x2,y2);
    }
}

void playerBrick::moveRight()
{
    if(exist(x1+10,y1,x2+10,y2)==1)
    {
        clean();
        x1+=10;
        x2+=10;
        setcolor(GREEN);
        rectangle(x1,y1,x2,y2);
    }
}

void playerBrick::clean()
{
    setcolor(BLACK);
    rectangle(x1,y1,x2,y2);
}

bool playerBrick::exist(double x1, double y1, double x2, double y2)
{
    if(x1>=10&&x2<=1370)
        return 1;
    else
        return 0;
}
//bricks.h
#ifndef BRICKS_H
#define BRICKS_H


class bricks
{
    public:
        bricks();
        bool exist();
        void clean(double x1, double y1, double x2, double y2);
    private:
        int a[7];
        double x1,y1,x2,y2;

};

#endif // BRICKS_H
//bricks.cpp
#include "bricks.h"
#include <iostream>
#include <graphics.h>

bricks::bricks()
{
    setcolor(RED);
    rectangle(20,50,220,150);
    rectangle(230,50,430,150);
    rectangle(440,50,640,150);
    rectangle(650,50,850,150);
    rectangle(860,50,1060,150);
    rectangle(1070,50,1270,150);
    for(int i=1; i<=6; i++)
        a[i]=1;
}

bool bricks::exist()
{

}

void bricks::clean(double x1, double y1, double x2, double y2)
{
    setcolor(BLACK);
    rectangle(x1,y1,x2,y2);
}
//ball.h
#ifndef BALL_H
#define BALL_H


class ball
{
    public:
        ball();
        bool exist(double x, double y);
        int hit(double x, double y);
        void clean(double x, double y, double r);
    private:
        double x,y,r;
        double atmX,atmY;
};

#endif // BALL_H
//ball.cpp
#include "ball.h"
#include <iostream>
#include <graphics.h>

ball::ball()
{
    setcolor(GREEN);
    x=625;
    y=350;
    r=50;
    circle(x,y,r);
}

bool ball::exist(double x, double y)
{
    if(x>=60&&x<=1440&&y>=60&&y<=640)
        return 1;
    else
        return 0;
}

int hit(double x, double y, double p, double q)// x si y pozitia actuala, p si q coordonatele tintei
{
    double biggerRatio;
    double r1,r2;
    r1=(p-x)/10;
    r2=(q-y)/10;
    if(r1>r2)
        biggerRatio=r1;
    else
        biggerRatio=r2;
    r1=r1/biggerRatio;
    r2=r2/biggerRatio;
    double i,j;
    for(i=x, j=y; i<=p, j<=q; i+=r1,j+=r2)// left hand operand of comma has no //effect
    {
        if(exist(x+r1,y+r2)==1)// error:  'exist' was not decleared in this //scope
            return 0;
        else
        {
            clean(x,y,50);// same for clean
            setcolor(GREEN);
            circle(x,y,50);
        }
    }
}

void ball::clean(double x, double y, double r)
{
    setcolor(BLACK);
    circle(x,y,r);
}

I get just these 2 errors and that warning. I don't know why.
The purpose of that hit function is to hit from a point of(x,y) in another (p,q);
like this i want to aim a random point at beggining and use this function to shoot there.
I need just to fix this problem and make 2 more functions:
1. to redirect the ball when it hits the wall
2. to destroy the bricks;

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