How i can to add a significant 0 to int?

Question

Help me, how to add a significant 0 to number variable (int, float, ecc)?

int s = 0; -> 00
int m = 0; -> 00
int h = 0; -> 00

What are doing with the output? Printing it? Creating a string? — dansalmo, Dec 27 '13 at 19:44
Your choice of variable names suggests you are implementing 'time'. Surely, there must be some class for that already in Java? Why re-invent the wheel? — Ruud Helderman, Dec 27 '13 at 20:09

score 8 · Answer 1 · answered Dec 27 '13 at 19:44

8

You can't add significant 0's to numbers; that is an aspect of how they are DISPLAYED, not the values themselves.

answered Dec 27 '13 at 19:44

Scott Hunter

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score 2 · Answer 2 · answered Dec 27 '13 at 19:46

2

You can't. However, you can change the way it's displayed, use String#format:

String res = String.format("%02d", s);

answered Dec 27 '13 at 19:46

Maroun

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score 0 · Answer 3 · answered Dec 27 '13 at 19:49

0

This doesn't mather when you do calculations. But another way of doing this would be:

int s = 10;
System.out.println((s > 9)? s : "0" + s);
s = 0;
System.out.println((s > 9)? s : "0" + s);

Output:

> 10
> 00

answered Dec 27 '13 at 19:49

Christian Tapia

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score 0 · Answer 4 · answered Dec 27 '13 at 19:51

0

You Can't do that.
Try

int v = 1;
String value = (v<=9)?"0"+v:v+"";
System.out.println(value);

OR
you can use String.format("%02d", v);

Output

answered Dec 27 '13 at 19:51

Rakesh KR

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score 0 · Answer 5 · answered Dec 27 '13 at 19:55

You could create a new class which contains an integer value and a number of significant zeros. Then you can override the toString() method in order to convert it to a string when you need to display it:

public class MyInteger{
    private int value;
    public int numOfZeros = 3; // default number of significant zeros
    public MyInteger(int val){
        this.value = val;
    }
    public String toString(){
        String format = new String("%0"+numOfZeros+"d");
        String s = new String(""+value);
        return String.format(format,s);
    }
}

In this way when you append this object to a string it will automagically converted in a string with the desired number of significant digits.

Problem resolved, thanks @Christian – Matrix Dec 28 '13 at 16:08 — Matrix, Dec 28 '13 at 16:08

How i can to add a significant 0 to int?

5 Answers5