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Thread: program that determines largest and smallest

  1. #1
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    Default program that determines largest and smallest

    Hi, I'm in a beginning java course and I had to write a program that determines the largest and smallest numbers entered by the user. My teacher wanted me to use -99 as the sentinel. I got the program to do what the teacher wanted with the inputs he told us to use however I have some issues with the smallest number if the number entered was more than 500 and the largest number less than zero so I was looking for some help with how to make my program work with all numbers. (keep in mind that I only have a fairly basic knowledge of java)

    import java.util.Scanner;
     
    public class LargestSmallest
    {
       public static void main (String[] args)
       {
          int userNumber;               //user entered number
          int largestSoFar = 0;         //Keeps track of largest number entered
          int smallestSoFar = 500;      //Keeps track of smallest number entered
          final int SENTINEL = -99;  
     
          Scanner keyboard =  new Scanner(System.in);
     
          //Get number from user
          System.out.print("Enter a positive whole number(enter -99 to terminate): ");
          userNumber = keyboard.nextInt();
     
          while (userNumber != SENTINEL)
          {
             if (userNumber > largestSoFar)
                largestSoFar = userNumber;
     
             if (userNumber < smallestSoFar)
                smallestSoFar = userNumber;
     
             System.out.print("Enter a positive whole number(enter -99 to terminate): ");
             userNumber = keyboard.nextInt();
          }  
     
          System.out.println();
          System.out.println("Largest number entered: " + largestSoFar);
          System.out.println("Smallest number entered: " + smallestSoFar);
       }
    }


  2. #2
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    Default Re: program that determines largest and smallest

    Well obviously the initial values you assign to largest and smallest are wrong. Check out the Integer class.
    Improving the world one idiot at a time!

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    Default Re: program that determines largest and smallest

    Look in the Math.* methods...

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    Default Re: program that determines largest and smallest

    Sorry I am going to rework my solution so it isnt so revealing, I have a bad habit of doing the work for the student

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    Default Re: program that determines largest and smallest

    your code so far
          int userNumber;               //user entered number
          int largestSoFar = 0;         //Keeps track of largest number entered
          int smallestSoFar = 500;      //Keeps track of smallest number entered
          final int SENTINEL = -99;  
     
          //Assume user puts int inside userNumber
     
          while (userNumber != SENTINEL)
          {
             if (userNumber > largestSoFar)
                largestSoFar = userNumber;
     
             if (userNumber < smallestSoFar)
                smallestSoFar = userNumber;
     
          //Assume user puts int inside userNumber
          }
    so your code does well to continue until the user flags it to stop, and is correct unless someone never enters a number larger then 0 or never smaller then 500.
    to fix this, unless your teacher gives you a default value, they have to start uninitialized.

    int largestSoFar;
    int smallestSoFar;

    this brings a new problem that you have to deal with, which is what if the first input is -99! your while loop never gets entered, so you need to think about how to handle that, it seems like a "special case" that an if statement might be up to solving on his own.

    Hope this helps,
    Jonathan

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