Tetris Sourcode - Making Tetris with C/C++

//START PONG
void linecall(int line,int computerlocal,int plrlocal,int ballx,int bally)
{
    int loopvar;
    if(computerlocal+3>=line&&computerlocal<=line)
{
    cout << "|";
    }else{
        cout << " ";
    }
if(bally==line)
{
loopvar=1;
while(loopvar<ballx)
{
    cout << " ";
    loopvar++;
}
cout << "O";
while(loopvar<40)
{
    cout << " ";
    loopvar++;
}
}else{
    cout << "                                        ";
}
if(plrlocal+3>=line&&plrlocal<=line)
{
    cout << "|";
}
cout << "\n";
}
void playpong(int diff)
{
system("cls");
//10 rows
//paddles 4
//40 cols
//dwnleft-1
//dwnright-2
//upleft-3
//upright-4
int computerlocal=1;
int plrlocal=1;
int ballx=20;
int bally=5;
int balldir=1;
int gamerun=1;
int loopvar;

while(gamerun==1)
{
//linecall
    loopvar=1;
    while(loopvar<=10)
    {
linecall(loopvar,computerlocal,plrlocal,ballx,bally);
loopvar++;
    }
    if(ballx>=41||ballx<=0)
    {
        if(ballx>=41)
        {
        gamerun=0;
        cout << "You Lost!\n";
        }else{
        gamerun=0;
        cout << "You Won!\n";
        }
    }else{
        //computer ai
        if((balldir==1)||(balldir==3))
        {
        if(((rand()%diff)*20)>(rand()%50))
        {
        if(computerlocal+2<bally)
        {
            computerlocal++;
        }
        if(computerlocal+2>bally)
        {
            computerlocal--;
        }
        }
        }
        if(computerlocal<1)
        {
            computerlocal=1;
        }
        if(computerlocal>7)
        {
            computerlocal=7;
        }
    //move ball
        if(ballx==40&&plrlocal+3>=bally&&plrlocal<=bally)
        {
            if(balldir==2)
            {
                balldir=1;
            }
            if(balldir==4)
            {
                balldir=3;
            }
        }
        if(ballx==1&&computerlocal+3>=bally&&computerlocal<=bally)
        {
            if(balldir==3)
            {
                balldir=4;
            }
            if(balldir==1)
            {
                balldir=2;
            }
        }
    if(bally==0)
    {
        if(balldir==3)
        {
            balldir=1;
        }
        if(balldir==4)
        {
            balldir=2;
        }
    }
    if(bally==10)
    {
        if(balldir==1)
        {
            balldir=3;
        }
        if(balldir==2)
        {
            balldir=4;
        }
    }
    if(balldir==1)
    {
        bally++;
        ballx--;
    }
    if(balldir==2)
    {
        bally++;
        ballx++;
    }
    if(balldir==3)
    {
        bally--;
        ballx--;
    }
    if(balldir==4)
    {
        bally--;
        ballx++;
    }
clock_t endwait;
endwait = clock () + .02 * CLK_TCK;
while (clock() < endwait) {}
    //key listen
    int ch;
    if(kbhit())
    {
  ch = getch();
   if ( ch == 0 || ch == 224 )
  {
    ch = 256 + getch();
  }
  if(ch==328)
  {
      plrlocal--;
  }
   if(ch==336)
  {
      plrlocal++;
  }
  if(ch==27)
  {
system("cls");
cout << "Pong game ended.\n";
gamerun=0;
  }
  if(gamerun==1)
  {
     system("cls");
  }
    }else{
            clock_t endwait;
endwait = clock () + .02 * CLK_TCK;
while (clock() < endwait) {}
system("cls");
    }
        if(plrlocal<1)
        {
            plrlocal=1;
        }
        if(plrlocal>7)
        {
            plrlocal=7;
        }
}
}
}
//END PONG