Level 7

07.02.2019
1567views
19comments

AM STUCK

Question about the task

Under discussion

My head just can't help to think more that this.

package com.codegym.task.task04.task0441; /* Somehow average */ import java.io.*; public class Solution { public static void main(String[] args) throws Exception { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String num1 = reader.readLine(); String num2 = reader.readLine(); String num3 = reader.readLine(); int a = Integer.parseInt(num1); int b = Integer.parseInt(num2); int c = Integer.parseInt(num3); if (a >= c || b >= c) { if (b <= c || a <= c) System.out.println(c); } else if (a >= b || c >= b) { if (c <= b || a <= b) System.out.println(b); } else if (b >= a || c >= a) { if (c <= a || b <= a) System.out.println(a); else if (a == c && c == b) { System.out.println(a); } else if (a == c && c != b || a == b && b != c) { System.out.println(a); }else if(b==c && c!=a || b==a && a!=c ) System.out.println(b); } } }

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Krzysztof

Level 15 , Lublin

4 December 2019, 19:10

int [] array = {a,b,c}; Arrays.sort(array); System.out.println(array[1]); beautiful in its simplicity :)

hidden #10424566

Level 7

8 February 2019, 15:43

I get it now .it even looks neater and simpler. Thank you

hidden #10424566

Level 7

8 February 2019, 14:48

Thank you though i did not get the whole sorting of number thing. I changed my code and this worked for me: if ((a>c && a<b) || (a>b && a<c) || (a==c || a==b)){ System.out.println(a); } else if ((b>a && b<c) || (b>c && b<a) || (b==a || b==c)){ System.out.println(b); } else if ((c>a && c<b) || (c>b && c<a) || (c==a || c==b)){ System.out.println(c)

Guadalupe Gagnon

Level 37 , Tampa, United States

8 February 2019, 14:54

observe:

public static void main(String[] args) throws Exception {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        int a = Integer.parseInt(reader.readLine());
        int b = Integer.parseInt(reader.readLine());
        int c = Integer.parseInt(reader.readLine());

        if(a >b) {
            int temp = a;
            a = b;
            b = temp;
        }

        if(b >c) {
            int temp = b;
            b = c;
            c = temp;
        }

        if(a >b) {
            int temp = a;
            a = b;
            b = temp;
        }

        System.out.println(b);
}

User

Level 5 , Shymkent, Kazakhstan

25 June 2019, 14:40

hey mate, Are you genius? Please explain to me how it works?

Cz Ferencz

Level 12 , Bucharest, Romania

4 December 2019, 18:53

What kind of witchcraft is this? :)))) triing to figure out how this works, also taking a look at that link. :)

Cz Ferencz

Level 12 , Bucharest, Romania

4 December 2019, 18:59

Witchcraft!!! :)))

Guadalupe Gagnon

Level 37 , Tampa, United States

4 December 2019, 19:58

This is just simple code to sort. take for example the number a = 3, b = 6, c= 2 Line 7: if (3 > 6) False - a = 3, b = 6, c= 2 Line 13: if(6 > 2) True - lines 14-16 swap b and c - Now: a = 3, b = 2, c= 6 Line 19: if(3 > 2) True - lines 20-22 swap b and c - Now: a = 2, b = 3, c= 6 ↑ EDIT: lines 20-22 are swapping a and b, NOT b and c b is now going to hold the value of the middle number. You can try it with any combination of numbers you want including when you enter the same numbers like 1,1,2 or something.

Abdul-Hamed Mohammed

Level 8 , canton, USA

13 February 2020, 08:44

I think you have a little typo "Line 19: if(3 > 2) True - lines 20-22 swap b and c - Now: a = 2, b = 3, c= 6" swap is a and b not b and c.

Guadalupe Gagnon

Level 37 , Tampa, United States

13 February 2020, 14:15

No typo Abdul, you need to follow the logic of the code. a=3, b=2, c= 6 after the if block on line 13.

Abdul-Hamed Mohammed

Level 8 , canton, USA

14 February 2020, 08:12

I am talking about line 19. So, my question is on Line 19 are we swapping b and c or a and b? If you say swap b and c - Then a=3, b=6, c=2

Guadalupe Gagnon

Level 37 , Tampa, United States

14 February 2020, 14:26

I see, there is a typo in my post above yours, not in the code I posted 4 up from that. I was looking at the code thinking that you thought line 19 was backwards. Thank you for pointing that out, i made an 'Edit'.

Andrei

Level 41

25 September 2020, 09:43

Hello, shouldn't you have else if after the first if statement?

Guadalupe Gagnon

Level 37 , Tampa, United States

25 September 2020, 13:22

no... it needs to check all three digits and make proper swaps. Take for example the numbers: 3, 1, 2 if I had it as else if instead of just 3 single if statements, after line 7 resulted in true and swapped 3 and 1, lines 13 and 19 would not be considered. The result would be that the numbers would look like this: 1, 3, 2 and the program would have the incorrect middle number.

Andrei

Level 41

1 October 2020, 19:06

So you are saying that if it had 1 if statement and 2 else ifs , if the first if statement were true, then it would have skipped the rest and go straight to the println line? Having multiple if statements forces the program to go through each of them ?

Guadalupe Gagnon

Level 37 , Tampa, United States

5 October 2020, 16:54

The keyword 'else' links 'if' statements together and tells the computer that they are all one structure. It will start execution from the very first if statement and then will only move to the next one if that results in false. When it encounters a statement that results in true, after executing the code in that true block, it will cease executing the structure line by line and move execution to the line following the whole structure. That means only the FIRST statement that results in true will be considered while the rest will not. When using a bunch of if statements without the else, every single one will be considered. so:

if(){}          // all 1 structure
else if() {} // ↓
else if() {} // ↓
//                 ↓
else if() {} // ↓
//                 ↓
else if() {} // to here


if() {}      // this 1 structure
else if{} // to here
if() {} // separate structure because no "else"

Andrei

Level 41

6 October 2020, 07:23

OK, that makes more sense now, thank you very much for taking the time and explaining in such detail! much appreciated! :)

X Khan

Level 8 , Palmdale, United States

19 October 2020, 08:19

Wow. i see how this works now. I even physically worked this out. I ripped 3 pieces of paper to represent the values 3, 6, and 2. And then layed out 4 books representing temp, a, b, and c. And I basically followed what you wrote and got to see how it is physically swapped when going through each conditional branch. Thank you abundantly for the thorough explanation. Sometimes what is important isn't just the solution alone, but underatanding why and how the solution works. Thanks again!

Guadalupe Gagnon

Level 37 , Tampa, United States

7 February 2019, 17:49

I recommend sorting the numbers first, which isn't too hard to do. Once they are sorted all you have to do is output b. Take a look at this link and see if you can implement the logic from the "book" into your code and clear the task: https://codereview.stackexchange.com/questions/38247/inputting-and-sorting-three-integers