I am a java beginner and practicing all myself. Please help me out in question stated below

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if n=4, then output should be
4
4x
4x2
4x21

here, multiples of 3 has been replaced by "x". Please tell me the logic of how to replace like this.

What I have tried:

class Main {
  public static void main(String[] args) {
    int n=4;
    int num=n;
    String str="";
    for(int i=1;i<=n;i++)
    {
      str=str+num;
      num--;
    System.out.println(str);
    }
    
    
  }
}

Posted 13-Mar-18 17:14pm

Member 13724614

Updated 13-Mar-18 20:16pm

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wseng · Answer 1 · 2018-03-13T19:50:00

Solution 1

Check whether str contains value 3. If contains, replace 3 with x

if (str.contains("3")) {
     str = str.replace("3", "x");
  }

To make all multiples of 3 replace by x , use below condition

if (num % 3 == 0) {
     str = str.replace(String.valueOf(num), "x");
}

Posted 13-Mar-18 19:50pm

wseng

Updated 13-Mar-18 21:28pm

v3

Comments

Member 13724614 14-Mar-18 2:09am

Sir the question is of all the multiples of 3 and not just 3. If I put the n=8, then????

wseng 14-Mar-18 3:31am

I have edited my answer.

Member 13724614 · Answer 2 · 2018-03-13T20:17:00

Solution 2

class Main {
  public static void main(String[] args) {
    int n=8;
    int num=n;
    String str="";
    for(int i=1;i<=n;i++)
    {
      if(str.contains("3"))
      {
        str=str.replace("3","x");
      }
      str=str+num;
      num--;
      System.out.println(str);
    }
    
    
  }
}

According to your given logic, its output is coming out to be
8
87
876
8765
87654
876543
87654x2
87654x21
which is wrong. I want this output
8
87
87x
87x5
87x54
87x54x
87x54x2
87x54x21

Posted 13-Mar-18 20:17pm

Member 13724614

Comments

wseng 14-Mar-18 3:30am

This is not an answer. You should edit your post instead of posting it as a solution.

Member 13724614 14-Mar-18 10:36am

i know this is not an an answer. But the column says" what you have tried" and not "give the exact solution. I am asking people to correct it as I have already said that I am not able to get the output.

wseng 14-Mar-18 21:27pm

have you tried my answer ?

Member 13724614 15-Mar-18 17:32pm

yes i have tried but the output is not coming

wseng 15-Mar-18 21:53pm

You mean nothing come out ?

Member 13724614 15-Mar-18 21:59pm

what came out, I have posted above. Please take a look at that sir

wseng 15-Mar-18 23:33pm

Please see my answer again. I have edited it few days ago

wseng 20-Mar-18 12:03pm

Any update for this question ?