BW

This is first structure. With Random.h, created array of integers size 9 and printed it.

Result is below. array 'num' will be used judge if arr[3][3] is well created(if there is no repeated number)

Now, I added judgement if that 'arr' array is created well so there is no repeated number. So, I added array named 'arrNum' size 9, which will save created numbers.

   int arrNum[9];

and substituted created numbers in it

and rearranged arrNum by ascending order, using bubblesort algorithm

Install Eclipse

create package & class

Helloworld class

package org.buster.javatutorials.eclipse;

public class Helloworld {

 public static void main(String[] args) {
  System.out.println("Hello world!");
 }
}

String class

print string that includes ""

public class String {

 public static void main(java.lang.String[] args) {
  System.out.println("egoing said\n\"Welcome programming world\"");
 }
}

Variables

Using variables increases recyclability of the codes

For example,

If I want to change first number 100 to 1000, I have to change all 4 lines. However, if I used variable for 100, I have to change only 1 line. See the below

So, using variables makes it easy for developer to maintenance the codes

2016.07.04