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Thread: Help needed with constructing a while loop please!

  1. #1
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    Default Help needed with constructing a while loop please!

    My task is to: Prompt the user for and read in the number of guesses the user wants at the random number.
    2. Generate (but not immediately display) the random number between 1 and 100.
    3. As long as the user has not yet guessed the random number and the number of guesses
    allowed has not been exceded:
    • Prompt the user to enter their next guess at the generated random number.
    • If the guess is smaller than the actual random number, print out a message indicating
    that the user’s guess is too small.
    • If the guess is larger than the actual random number, print out a message indicating
    that the user’s guess is too large.
    4. If the user succeeded in guessing the random number, then print out a congratulatory
    message and tell them how many guesses they took.
    5. If the user did not succeed in guessing the random number, the number should be displayed.

    import java.util.*;
     
    public class SimpleGame {
     
    public static void main(String args[])
        {
        int numGuess;
        int userGuess;
     
        // Prompt User for Number of guesses as well as What guess the user intends to input
        Scanner kbd = new Scanner(System.in);
        System.out.print("How many guesses do you want?");
        numGuess = kbd.nextInt();
     
        System.out.println("What is your guess?");
        userGuess = kbd.nextInt();
     
     
        while (numGuess == 1)
     
        {
               if (userGuess == 63)
                   System.out.print("Congratulations, you guessed the number right!");
               else if (userGuess >= 63)
                   System.out.println("Sorry, your guess is too high");
               else if (userGuess <= 63)
                   System.out.println("Sorry, your guess is too low");
                   System.out.println("The number was 63");
               break;
     
        }        
     
    while (numGuess == 2)
     
        {
               if (userGuess == 36)
                   System.out.print("Congratulations, you guessed the number right!");
               else if (userGuess >= 36)
                   System.out.println("Sorry, your guess is too high");
               else if (userGuess <= 36)
                   System.out.println("Sorry, your guess is too low");
                   System.out.println("The number was 36");
               userGuess += 2;
               numGuess += 2;
               break;
     
        }

    So when i run this, it prompts me once yeah but i am a bit confused as to how i may get it to prompt me 2 or 3 or 4...etc times in a row, so if anyone could assist me with this, that would be very helpful.

    thanks


  2. #2
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    Default Re: Help needed with constructing a while loop please!

    A way to accomplish that is with a do...while loop. You can first ask the user how many guesses he want and then execute the do block as many times as the guesses.

  3. #3
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    Default Re: Help needed with constructing a while loop please!

    thank you, i have done that

    public class SimpleGame {
     
    public static void main(String args[])
    	{
    	int numGuess;
    	int userGuess = 0;
    	Scanner kbd = new Scanner(System.in);
     
     
     
     
     
     
    	do 
    	{
    		//Prompt User for Number of guesses as well as What guess the user intends to input
    		System.out.print("How many guesses do you want?");
    		numGuess = kbd.nextInt();
     
    		System.out.println("What is your guess?");
     
    		if (numGuess == 1)
    		{
    		userGuess = kbd.nextInt();
    		}
     
    		if (numGuess == 2)
    		{	
    		userGuess = kbd.nextInt();
    		userGuess = kbd.nextInt();
     
    		}
    		if (numGuess == 3) 
    		{
    		userGuess = kbd.nextInt();
    		userGuess = kbd.nextInt();
    		userGuess = kbd.nextInt();
    		}
    		if (numGuess == 4)
    		{	
    		userGuess = kbd.nextInt();
    		userGuess = kbd.nextInt();
    		userGuess = kbd.nextInt();
    		userGuess = kbd.nextInt();
    		}
     
    		if (numGuess ==5)
    		{
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
     
    		}
     
     
    		if (numGuess ==6)
    		{
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
     
     
    		}
     
    		if (numGuess ==7)
    		{
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    		}
     
    		if (numGuess ==8)
    		{
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
    			userGuess = kbd.nextInt();
     
    		}
     
     
    }
     
     
     
    	while (numGuess == userGuess);
     
     
    	       if (userGuess == 63)
    	    	   System.out.print("Congratulations, you guessed the number right!");
    	       else if (userGuess >= 63)
    	    	   System.out.println("Sorry, your guess is too high");
    	       else if (userGuess <= 63)
    	    	   System.out.println("Sorry, your guess is too low");
    	           System.out.println("The number was 63");
     
     
     
     
    	}
    }

    now, i need to find a way to implement a infinite amount of guesses, if you could assist me with this, that would be great.

    thanks

  4. #4
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    Default Re: Help needed with constructing a while loop please!

    andreas90
    I have tried to simplify the code as my previous code was a bit much
    this is how it looks:
     
     
     
    import java.util.*;
    public class SimpleGme2 {
     
     
    	public static void main(String args[])
    	{
    	int counter = 0;
    	int numGuess;
    	int userGuess = 0;
    	Scanner kbd = new Scanner(System.in);
    	Random n = new Random ();
    	int number = 0;
     
     
    	//Prompt User for Number of guesses as well as What guess the user intends to input
    	    System.out.print("How many guesses do you want?");
     
     
     
    	while (counter < 10)
    	{
    		number = n.nextInt();
    		numGuess = kbd.nextInt();
     
    	if (number == 63 )
    		System.out.print("Congratulations, you guessed the number right!");
    	    break;	
    		}
     
    	if (number >= 63)
    		System.out.println("Sorry, your guess is too high");
     
    	else if (number <= 63)
    		System.out.println("Sorry, your guess is too low");
     
     
     
     
     
     
     
    	}
    }

    thanks

  5. #5
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    Default Re: Help needed with constructing a while loop please!

    Okay there is a problem with your pseudo-code. This is what your program is doing:

    Do infinite number of times   (note that the counter is never incremented so it will never be greater than 10)
       Generate a random number  (note that this is never used)
       Ask the user for a number
       If number == 63  print "Congratulations"
       If number < 63 print "Higher"
       If number > 63 print "Lower"
    End do

    Here is the proper pseudo-code for a higher/lower game
    Do
       Ask the user for the maximumNumberOfGuesses
       Generate a random number (number)
       Set guessCount == 0
       Do
          Ask the user for an input (userInput)
          Increment the guess count (count)
          If count > maximumNumberOfGuesses
              print "You have run out of guesses. You Loose."
              print "The correct answer was: " + number
              exit Do
          If number < userInput print "Higher"
          If number > userInput print "Lower"
          If number == userInput 
              print "Congratulations. You Win."
              Ask if the user wants to play again
              if true
                 go to start of the program
              else
                 exit program
           End do
    End do

    I cannot just give you the code for this as it would rob you of the learning experience. In fact providing you with the pseudo-code like this is probably the same thing because this is an exercise in structuring a program.

    Do me a favor and take a look at how I analyzed the question and wrote it out as a step of instructions that a human could follow step by step. This is called pseudo-code and it is essential for structuring your programs correctly. Your code is pretty good for a new programmer but I wanted to help you out here because the code reminded me of my own when I first started; syntactically correct but schematically wrong. So PLEASE do not just look at this pseudo-code and start writing code. Go over the question again and write your own pseudo-code. Compare it to mine if you need. Then start writing code. My golden rule is; every 10 minutes of planning will save you 1hr of programming.

  6. #6
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    Default Re: Help needed with constructing a while loop please!

    Christopher Lowe, thank you for the help, i will put your advise to good use.

    Thanks once again.

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