How do I get the max and min values from a set of numbers entered?

Question

Below is what I have so far:

I don't know how to exclude 0 as a min number though. The assignment asks for 0 to be the exit number so I need to have the lowest number other than 0 appear in the min string. Any ideas?

int min, max; Scanner s = new Scanner(System.in); System.out.print("Enter a Value: "); int val = s.nextInt(); min = max = val; while (val != 0) { System.out.print("Enter a Value: "); val = s.nextInt(); if (val < min) { min = val; } if (val > max) { max = val; } }; System.out.println("Min: " + min); System.out.println("Max: " + max);

Simply have two variables, one called min one called max, and then check the entered variable to see if it is less than min or greater than max. If so, reset the variable. — Hovercraft Full Of Eels
– Hovercraft Full Of Eels, Commented Oct 30, 2013 at 0:03
Would they go inside the for or the if. Or outside the loop entirely? — user2934299
– user2934299, Commented Oct 30, 2013 at 0:03
Please play with your code, experiment, try. That's how you learn. — Hovercraft Full Of Eels
– Hovercraft Full Of Eels, Commented Oct 30, 2013 at 0:04
@ Hovercraft Full Of Eels Ok, that makes sense. I'll give that a go, thanks. — user2934299
– user2934299, Commented Oct 30, 2013 at 0:04

Community · Accepted Answer · 2016-01-01 12:34:29Z

Here's a possible solution:

public class NumInput { public static void main(String [] args) { int min = Integer.MAX_VALUE; int max = Integer.MIN_VALUE; Scanner s = new Scanner(System.in); while (true) { System.out.print("Enter a Value: "); int val = s.nextInt(); if (val == 0) { break; } if (val < min) { min = val; } if (val > max) { max = val; } } System.out.println("min: " + min); System.out.println("max: " + max); } }

(not sure about using int or double thought)

Thankyou, it makes sense now. Cant believe I couldnt figure that out on my own. One question, for the first solution: Integer.MAX_INT; Integer.MIN_INT; are these final's? or some kind of java method? sorry if its a stupid question, but im pretty new to all this.
@user2934299 They are constants. They represent, respectively, the maximum and the minimum number that a int can store.

Bernhard Barker · Accepted Answer · 2017-05-02 14:54:00Z

3

You just need to keep track of a max value like this:

int maxValue = 0;

Then as you iterate through the numbers, keep setting the maxValue to the next value if it is greater than the maxValue:

if (value > maxValue) { maxValue = value; }

Repeat in the opposite direction for minValue.

edited May 2, 2017 at 14:54

Bernhard Barker

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answered Oct 30, 2013 at 0:03

MattSenter

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6 Comments

Hovercraft Full Of Eels Over a year ago

Best to nudge him and let him create the code. Otherwise you cheat him out of a decent learning experience.

user2864740 Over a year ago

I would still use Math.max/Math.min in this case (an "extra" assignment doesn't bother me) but it's probably not quite what the lesson is looking for.

MattSenter Over a year ago

@HovercraftFullOfEels I think we're safe with this one...don't think he'll forget this regardless of how he came to it. Besides, he still has to do the code for the minValue. =)

user2934299 Over a year ago

How would I assign the minValue, I dont know what number to assign it to. The user could enter 99999999999999999999999999999 and that could be the min, but i dont want to have 99999999999999999999999999999 in my code. Maybe the Math class would be better to use.

MattSenter Over a year ago

Just set the minValue to the first value entered and update it only if a new value is less than the first value. Using Integer.MIN_VALUE would be horribly flawed.

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gadolf · Accepted Answer · 2018-08-12 11:10:17Z

It is better

public class Main { public static void main(String[] args) { System.out.print("Enter numbers: "); Scanner input = new Scanner(System.in); double max = Double.MIN_VALUE; double min = Double.MAX_VALUE; while (true) { if ( !input.hasNextDouble()) break; Double num = input.nextDouble(); min = Math.min(min, num); max = Math.max(max, num); } System.out.println("Max is: " + max); System.out.println("Min is: " + min); } }

tanou · Accepted Answer · 2015-04-21 15:47:23Z

//for excluding zero public class SmallestInt { public static void main(String[] args) { Scanner input= new Scanner(System.in); System.out.println("enter number"); int val=input.nextInt(); int min=val; //String notNull; while(input.hasNextInt()==true) { val=input.nextInt(); if(val<min) min=val; } System.out.println("min is: "+min); } }

Zuko Khephu · Accepted Answer · 2015-05-24 14:59:14Z

This is what I did and it works try and play around with it. It calculates total,avarage,minimum and maximum.

public static void main(String[] args) { int[] score= {56,90,89,99,59,67}; double avg; int sum=0; int maxValue=0; int minValue=100; for(int i=0;i<6;i++){ sum=sum+score[i]; if(score[i]<minValue){ minValue=score[i]; } if(score[i]>maxValue){ maxValue=score[i]; } } avg=sum/6.0; System.out.print("Max: "+maxValue+"," +" Min: "+minValue+","+" Avarage: "+avg+","+" Sum: "+sum);} }

newbie · Accepted Answer · 2016-07-05 12:14:57Z

here you need to skip int 0 like following:

val = s.nextInt(); if ((val < min) && (val!=0)) { min = val; }

Al Masud · Accepted Answer · 2018-04-06 10:24:02Z

System.out.print("Enter a Value: "); val = s.nextInt();

This line is placed in last.The whole code is as follows:-

public static void main(String[] args){ int min, max; Scanner s = new Scanner(System.in); System.out.print("Enter a Value: "); int val = s.nextInt(); min = max = val; while (val != 0) { if (val < min) { min = val; } if (val > max) { max = val; } System.out.print("Enter a Value: "); val = s.nextInt(); } System.out.println("Min: " + min); System.out.println("Max: " + max); }

mumun · Accepted Answer · 2020-09-27 06:31:50Z

I tried to optimize solution by handling user input exceptions.

public class Solution { private static Integer TERMINATION_VALUE = 0; public static void main(String[] args) { Integer value = null; Integer minimum = Integer.MAX_VALUE; Integer maximum = Integer.MIN_VALUE; Scanner scanner = new Scanner(System.in); while (value != TERMINATION_VALUE) { Boolean inputValid = Boolean.TRUE; try { System.out.print("Enter a value: "); value = scanner.nextInt(); } catch (InputMismatchException e) { System.out.println("Value must be greater or equal to " + Integer.MIN_VALUE + " and less or equals to " + Integer.MAX_VALUE ); inputValid = Boolean.FALSE; scanner.next(); } if(Boolean.TRUE.equals(inputValid)){ minimum = Math.min(minimum, value); maximum = Math.max(maximum, value); } } if(TERMINATION_VALUE.equals(minimum) || TERMINATION_VALUE.equals(maximum)){ System.out.println("There is not any valid input."); } else{ System.out.println("Minimum: " + minimum); System.out.println("Maximum: " + maximum); } scanner.close(); } }

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