working with Scanner

[Theresa Marlin]

I have to wrote the following code:

import java.util.Scanner;
import java.util.Random;

class ch20_ex8
{
  public static void main(String args[ ])
  {
    Scanner scan = new Scanner( System.in );
    Random rand = new Random();
    
    int rounds, number, counter = 1;
    double player1Guess, player2Guess, decimal, completeNumber, squareRoot, distancePlayer1 = 0, 
      distancePlayer2 = 0;
    String player1, player2;
    
    System.out.println("How many rounds? ");
    rounds = scan.nextInt();
    
    System.out.println("First Player, sign in-->");
    player1 = scan.nextLine();
    
    System.out.println("Second Player, sign in-->");
    player2 = scan.nextLine();
    
    while (counter <= rounds)
    {
      number = rand.nextInt(100)+1;
      decimal = rand.nextDouble();
      completeNumber = number + decimal;
      
      System.out.println("What is the square root of " + completeNumber + "\t ?");
      
      System.out.print(player1 + ", your guess: ");
      player1Guess = scan.nextDouble();
      
      System.out.print(player2 + ", your guess: ");
      player2Guess = scan.nextDouble();
      
      squareRoot = Math.sqrt(completeNumber);
      
      if (player1Guess >= squareRoot)
        distancePlayer1 = player1Guess - squareRoot;
      
      else if (player1Guess < squareRoot)
        distancePlayer1 = squareRoot - player1Guess;
      
      System.out.println(player1 + " is " + distancePlayer1 + " away");
      
      
      if (player2Guess >= squareRoot)
        distancePlayer2 = player2Guess - squareRoot;
      
      else if (player2Guess < squareRoot)
        distancePlayer2 = squareRoot - player2Guess;
      
      System.out.println(player2 + " is " + distancePlayer2 + " away");
      
      if (distancePlayer1 < distancePlayer2)
        System.out.println(player1 + " wins!");
      
      else if (distancePlayer2 < distancePlayer1)
        System.out.println(player2 + " wins!");
      
      else if (distancePlayer1 == distancePlayer2)
        System.out.println("It's a tie!");
      
      
      counter++;
      
    }
    
  }
  
}

and every time I compiled and ran it, it would skip over the input of player 1's name, and go right to player 2. As far as I can see, the two are identical in syntax. Any suggestions?

[Henry Wong]

Theresa Marlin wrote:
and every time I compiled and ran it, it would skip over the input of player 1's name, and go right to player 2. As far as I can see, the two are identical in syntax. Any suggestions?

Basically, when you asked for "how many rounds?", you only read an int. This doesn't read a whole line, it just reads an int token. Later, when you ask for the first player, you read a line. This reads from the current location to the end of the line. The current location is just after the int -- so the first player is the blank string from the end of the int to the carriage return of the line.

Henry

[Theresa Marlin]

This makes sense, thanks!