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Thread: hello! can i please get some help with a simple loop problem?

  1. #1
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    Default hello! can i please get some help with a simple loop problem?

    hello , im just begining my java programing. forgive me if im displaying my code wrong , but this the only way i could figure it out lol .been trying to do these loop problems in my book but ive gotten stuck on the very first problem , which is suppossed to be easy lol . anyhow this is as far as ive got. im supposed to:
    Write a program that does the following:

    1 .Prompt the user to enter a series of positive integers until they enter -1.
    2 .After all of the integers have been entered, display the min and max values of all the integers to the user.
    NOTE: -1 should never be considered as a min or max
    import java.util.Scanner;

    so far i have it so that it asks for the integer ina loop and it ends when the user puts a -1. i just dont understand how to select the max and min values and display them. i can only use loops , as that how far we've gotten in class.

     
     
    import java.util.Scanner;
     
       public class MinMax {
           public static void main(String [] args) {
    	         // creates the scanner
                Scanner input = new Scanner(System.in);
    		int number;
     
     
    	do {
    		System.out.print("Enter a positive integer (enter -1 to end): ");
    		       number = input.nextInt();
     
     
     
    			}
    			while (number !=-1);
    			System.out.println("max value is ");
     
    	}
    }


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    Default Re: hello! can i please get some help with a simple loop problem?

    Hi and welcome to the forum zerocool18!
    forgive me if im displaying my code wrong , but this the only way i could figure it out
    It is not wrong, but by saying [code=java] instead of just [code] you also get java style highlighting on the code as seen below:

    import java.util.Scanner;
     
    public class MinMax {
     
       /**pretty javadoc color*/
       public static void main(String[] args) {
          // creates the scanner
          Scanner input = new Scanner(System.in);
          int number;
     
          do {
             System.out.print("Enter a positive integer (enter -1 to end): ");
             number = input.nextInt();
          } while(number != -1);
          System.out.println("max value is ");
       }
    }
    Given a list of numbers, how would you keep track of the largest and smallest without the use of a computer? Pretend I am giving you a list of numbers, and you were to use a pencil and paper to do the work. Think about the steps you would take and write them down. Once you have the plan (algorithm) you can start working on how to solve the problem in code.

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    Default Re: hello! can i please get some help with a simple loop problem?

    alright , well i would take the list of numbers and sort them in order from the largest to smallest . the largest would be my max. then id take the numbers again and sort them from smallest to largest and smallest number would be my min. what i dont get is how i would be able to sort the numbers from only 1 input? i was also thinking that maybe my input method might be wrong. I did a triangle problem similar to this , without loops. but in that problem , we had a set number of inputs. the user entered 3 sides of a triangle and we stored each side separately and you could easily sort the values from that. but in this case , theres not a set number of inputs the user could enter. they could enter how many numbers they please. thats whats confusing me.

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    Default Re: hello! can i please get some help with a simple loop problem?

    First number given is 24.
    24 is now the min. 24 is now the max.

    Second number given is 48.
    24 is still the min. 48 is now the max.

    Third number is 12.
    12 is now the min. 48 is still the max.

    Fourth number given is 32.
    12 is still the min. 48 is still the max.

    Fifth number given is 92.
    12 is still the min. 92 is now the max.

    Sixth number given is -1.
    Final results are min = 12 and max = 92.

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    Default Re: hello! can i please get some help with a simple loop problem?

    thanks alot for the help , well see how it goes. it makes since in my head, but sometimes i lose it when i try to put it into code lol . ill let you know how it works out!!

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    Default Re: hello! can i please get some help with a simple loop problem?

    well i ended up with this lol. been trying all night , and i no its probably way off.

    import java.util.Scanner;
     
       public class MinMax {
           public static void main(String [] args) {
    	         // creates the scanner
                Scanner input = new Scanner(System.in);
     
    			int number;
    			int max=0;
    			int min=0;
    			int counter = 0;
    			System.out.println("Enter an integer ( press -1 to quit)");
     
     
    	do {
    		System.out.print("Enter a positive integer (enter -1 to end): ");
    		      number = input.nextInt();
     
    			 if (number> max ){
    			     number = max;	
    			 }
    			  else if (number<max ) {
    			         number = min;
    			   }
    			}
    			while ( number !=-1);
    			System.out.println("max value is " +max);
    			System.out.println("min value is "+min);
    	}
    }

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    Default Re: hello! can i please get some help with a simple loop problem?

    The posted code does not validate the input to the extent that the given integer must be >= -1.
    If -1 is given, the loop should end without comparing -1 to max/min. Otherwise min would always be set to -1 on the way out of the loop.
    The logic in the code for max seems correct, but I am not so sure the min is.
    I would think the first iteration through the loop would be special. The first iteration there is no previous min/max, and the number given would be the min and max.

    So if this were my project, I would start by writing down the requirements of the project in list style. Then sort them into the order that they should be done in. For example if -1 is given, do not try to compare to max/min. So checking for -1 would be a step required to be done before comparing max/min. This ordered list will be useful in keeping the code on track. What I like to do is break the steps down into smaller steps. Then go over the list of steps again and break each step down more and more until each step seems so simple. Then as I write code I start with the first step, and get the code working to that point, and test before moving on to add code for the next step.

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