Hi Coders !

Question about the task

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I'm in trouble with loops.what should I do? It's little hard.

package com.codegym.task.task04.task0437; /* Triangle of eights */ public class Solution { public static void main(String[] args) throws Exception { //write your code here for (int i = 0 ; i < 1 ; i ++) { System.out.println(8) ; } for (int j = 1 ; j < 10 ; j ++) { System.out.println(8) ; } } }

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raulGLD

Level 8 , Cluj-Napoca, Romania

21 October 2020, 13:48

Hey, in your first for loop, you should go until i < 10. Also in the first loop, you don't want to print anything because you don't need to do it, first loop is only to help you count the rows, not the prints. Then, second for loop needs to go inside the first for loop (you did 2 separate loops), and in your second for loop, j should go from j to <= i (j <= i), because you only want to print as many 8s as the row you're on (1st row means one 8, 2nd row means two 8s and so on..) and since the first loop goes 10 times, you will print the correct triangle of 8s. And also, when printing 8 in the second for loop, do it in one line (print instead of println) and after finishing the 2nd for loop, print a new line. Check the code below, but please make sure you understand the logic before copy-pasting it in your exercise.

for (int i = 0; i < 10; i++) {
      for (int j = 0; j <= i; j++) {
          System.out.print(8) ;
      }
      System.out.println();
}

Шарох Team Lead

21 October 2020, 15:16

Thank you !

Dmitri

Level 22 , Seversk, Russia

21 October 2020, 13:18

for(int i = 9; i > = 0 ; i--) for(int j = 0; j<10 - i ; j++)

Misiu

Level 41 , Gdansk, Poland

21 October 2020, 12:28

i - number of line and number of "8"s in line, so: inner loop (filling line) from 1 to i outer loop from 1 to 10

Шарох Team Lead

21 October 2020, 12:47

I dont understand :( for(j=1 ; j <=10 ; j++) // outer loop for(i=1 ; ??? ; i++) // inner loop i : number of lines /height j : number of 8 in each line?

Misiu

Level 41 , Gdansk, Poland

21 October 2020, 12:53

inner loop, i: 1, j, i++ j : number of lines /height i : number of 8 in each line

Шарох Team Lead

21 October 2020, 13:26

It doesnt work :( for (int j = 1 ; j <= 10 ; j ++) { for (int i = 1; j ; i ++) { System.out.println(8) ; } System.out.println() ;

Misiu

Level 41 , Gdansk, Poland

21 October 2020, 13:43

inner: i <= j Take care of println() and print().

sourav bamotra

Level 20 , jammu, India

21 October 2020, 14:04

for time being just remember while working with patterns like this. Outer loop works with rows and inner loop works with column. Just as you are working with matrix.

Шарох Team Lead

21 October 2020, 15:20

Thank you Misiu !

Шарох Team Lead

21 October 2020, 15:21

Thank you !