int player1_score = 0, player2_score = 0; // Scores of the players.int paddle1 = 300, paddle2 = 300; // The positions of the paddles.while(player1_score < 10 && player2_score < 10) // while both players have less than 10 points. {  int bx = 400; // Ball's position on the x axis.  int by = 300; // Ball's position on the y axis.  int dx;       // Ball's direction on the x axis.  int dy;       // Ball's direction on the y axis.  dx = rand()%2?1:-1; // Have the ball randomly move in either a positive  dy = rand()%2?1:-1; // or negetive direction on each axis.  while(true) // Main loop. We do drawing, updating, and input from the user here.   {    bx += dx; // Move ball on the x axis.    by += dy; // Move ball on the y axis.    if(bx >= 799) // Ball hit the right of the screen.     {      if(by < paddle2 - 50 || by > paddle2 + 50) // Player 2 missed the ball.       {        ++player1_score; // Increase player 1's score.        break; // Break out of the main loop.       }      dx = -1; // Reverse the ball's direction on the x axis.     }    if(by >= 599) // Ball hit the bottom of the screen.     dy = -1; // Reverse the ball's direction on the y axis.    if(bx <= 0) // Ball hit the left of the screen.     {      if(by < paddle1 - 50 || by > paddle1 + 50) // Player 1 missed the ball.       {        ++player2_score; // Increase player 2's score.        break; // Break out of the main loop.       }      dx = 1; // Make the ball move in a positive direction on the x axis.     }    if(by <= 0) // Ball hit the top of the screen.     dy = 1; // Make the ball move in a positive direction on the y axis.    /* Do drawing, input from player, and whatever else here. */   } }/* The game is now over. Congradulate the winner. */