Keeping the zeros from user input infront of numbers C#

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I am making a program that take user input and increment it.
Assume input is 001 it will be 002, 003 etc.
assume input is 01 it will be 02, 03 etc
assume input is 1 it will be 2, 3 etc so on.
I know we have to convert input to string save the padding of zeros increment the int and put the 2 variables together but I don't know how to implement it.
This is what I have.

What I have tried:

int Number = number;
    foreach (FileInfo file in files)
            {
 graphics.DrawString((preFix + (Number++).ToString().PadLeft(batesNumber, '0')), font, brush, position);
}

I think I need to do the padding outside of the foreach and replace the '0' with a variable string that has number of zeros based on user input. then increment the int inside the forech and just append the string of zeros to that int. Thanks

Posted 8-Jan-20 8:28am

AskalotLearnalot

Updated 8-Jan-20 8:52am

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Richard MacCutchan 8-Jan-20 15:16pm

You just need to scan the input as a string and count the number of digits. You can then use that value to set the padding on output.

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Tomas Takac · Accepted Answer · 2020-01-08T08:53:00

Solution 1

I would do it like this:

C#

string input = "000001";
int padding = input.Length;
string template = string.Format("{{0:d0{0}}}", padding); // {0:d04}

for (int number = 1; number < 15; number++)
{
    var paddedNumber = string.Format(template, number);
    Console.WriteLine(paddedNumber);
}

Posted 8-Jan-20 8:53am

Tomas Takac

Updated 8-Jan-20 9:39am

v2

Comments

AskalotLearnalot 8-Jan-20 15:04pm

Thank you for the replay,I think this neglects the user input. from my understanding padding will be always 4 or less what if user input 000001

Tomas Takac 8-Jan-20 15:38pm

I updated the solution, what about now?

AskalotLearnalot 8-Jan-20 15:43pm

if user input 01 the out put will be 000001 it should be 01, etc.

Tomas Takac 8-Jan-20 15:54pm

I don't follow. The input variable in the sample represents your input. Try to run it with input = "01" and you will see it works.

AskalotLearnalot 8-Jan-20 16:26pm

You are very correct I am sorry I responded too fast. Thanks for the clarification here is what i did:

string Number = number;
int padding = Number.Length;
string template = string.Format("{{0:d0{0}}}", padding);
foreach{
//(padding++)) will make number start at user input then ++ 
 var paddedNumber = string.Format(template, (padding++)); 
  graphics.DrawString((preFix + (paddedNumber)), font, brush, position);
}

hopefully one day I will have enough knowledge to help others like you do

Tomas Takac 9-Jan-20 5:57am

Great. BTW I don't think you want to increment padding. Instead you may want to do something like this:
int padding = input.Length;
int number = int.Parse(input);
foreach... number++

AskalotLearnalot 8-Jan-20 16:29pm

if you can explain it that would be even better.like this part
string template = string.Format("{{0:d0{0}}}", padding);

Tomas Takac 9-Jan-20 5:55am

This creates a string format template, {{ and }} is to escape the curly brackets to put create string like {0:d0<your number="" here="">}. Now I'm thinking this is easier:
string format = string.Format("d0{0}", padding);
int paddedNumber = number.ToString(format);

AskalotLearnalot 9-Jan-20 8:46am

thank you.