DOS - Batch question regarding leading zeros

Hello all,
I don't kow if this is a good place for this question but I couldn't find any other place to put it.
So here it goes. I'm reading a byte from a HEX file that is transformed from hexa to ascii. My input could would be 1,2 or 3 symbols as on byte is from 0 to 255. What I want is a batch script to put leading zeros to this string to always have 3 digits. So I need a transformation from 01 to 001 as example. The problem is that could be 1 or 01... so I don't know if I have to put 1 or 2 leading zeros...
Thanks!

Quote:

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Originally Posted by vma

Hello all,
I don't kow if this is a good place for this question but I couldn't find any other place to put it.
So here it goes. I'm reading a byte from a HEX file that is transformed from hexa to ascii. My input could would be 1,2 or 3 symbols as on byte is from 0 to 255. What I want is a batch script to put leading zeros to this string to always have 3 digits. So I need a transformation from 01 to 001 as example. The problem is that could be 1 or 01... so I don't know if I have to put 1 or 2 leading zeros...
Thanks!

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Code:

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#include <string>
#include <fstream>
#include <iostream>

using namespace std;

string LeadingZeros(const string& hexstr)
{
    switch(hexstr.length())
    {
        case 1:
            return "00";
        case 2:
              return "0";
    }
    return "";
}

int main()
{
    fstream infile("q:\\hex.txt");
    if ( !infile )
        return -1;
  string hexstr;
  while (!infile.eof())
  {
        infile >> hexstr;
        hexstr = LeadingZeros(hexstr) + hexstr;
        cout << hexstr << endl;
  }
} 

Hex.txt:

001
02
03
4
12
145

Output:
001
002
003
004
012
145

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Regards,

Paul McKenzie

Thank you, but as I wrote up there I need a batch script. This means really DOS :)

Quote:

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Originally Posted by vma

Thank you, but as I wrote up there I need a batch script. This means really DOS :)

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Doesn't change the fact that this is a C++ forum. Is the code not useful for you?

Here is a forum that this thread would have been relevant in.

This is a C++ forum. You can just compile the program, pass in the arguments in main(), and there you have your "script".

Regards,

Paul McKenzie

I kow this is not a script forum and that's why I wrote:

Quote:

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I don't kow if this is a good place for this question but I couldn't find any other place to put it.

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This is the closest I could find and that's why I hoped for an answer. If it really offends you I will delete it.