how to add leading zeros to String

[ram23]

Hi friends,

i need help ..

i am getting String value and i need to add leading zeros..
total length of Target string is 13char

eg: suppose if i get 12 as values..
it needs to convert into 0000000000012

suppose if i get 125 .it needs convert into 0000000000125

target string should be 13char..

we need to add leading zeros to the source string to make result string to 13 char and result string needs to retun

please help me

Ram

[dmjpro]

welcome to TSDN.
this site is not for post the code from begining.
if u have a problem with ur code then the experts r here to correct ur code.
soooooo........ ........

how much u did?

try to write the code ur self.
then post that code if u facing any problem.

best of luck.
kind regards.

dmjpro.

[ram23]

hi thanks for your reply

i am new java,,,

i tried with this code...

String addZeros(Sting a)
{
int i=0;
i=a.length();

if ( i = 13 )
return a;
else
{
int j= 13 - i;
for (int k=0; k<=j; j++)
{a="0"+a;}
return a;
}
}


my systems getting hanging....
please guide

[rsrinivasan]

Hi,

Im beginers for java.

I write to add 0's in leading space. try it and give ur comments whether it satisfies ur needs or not.

public class ArrayCheck 
{
    public static void main(String[] args) 
    {
        String str="";
        int temp;
        str="125";
        temp = 13-str.length();
        System.out.println("Length: "+temp);
        for(int i=0;i<temp;i++)
        {
            str="0"+str;
        }
        System.out.println(str);
    }
}    

Thanks,
Srinivasan r.

[rsrinivasan]

Hi,
In ur code remove '=' with '=='. Then try to run this program.Also delete '=' in for loop..

Thanks,
Srinivasan r.

[rsrinivasan]

Hi,

I fix the problem in ur code.

Why it is hanging is you did not increment 'k' value.

The Correct code is

String addZeros(String a)
{
int i=0;
i=a.length();
if ( i == 13 )
return a;
else
{
int j= 13 - i;
for (int k=0; k<j; k++)
{
a="0"+a;
}
return a;
}
}

Run it...

Thanks..
Srinivasan r.

[ram23]

Hi Srinvasan..

thanks for finding my poblem...
i given j++ instead of k++

my problem solved..

thanks for your help

regards
Ram

[JosAH]

Here's a little trick: you don't need a loop at all; have a look:

String prependZeros(int number) { // number >= 0
   String s= "000000000000"+number; // twelve zeros prepended
   return s.substring(s.length()-13); // keep the rightmost 13 chars
}

kind regards,

Jos

[sateesht]

Hi,

public class StringTest
{
public static void main(String[] args)
{
String str="0000000000 000";
String str1="abcd";
String str2=str+str1;
int k=str1.length() ;
System.out.prin tln(str2.substr ing(k,str2.leng th()));
}
}


Cheers,
Sateesh.

[princessmarquez]

to: JosAH

thanks for a two lines of code that solved the problem :-)