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# How can modify a field to pad the left side with zeroes so that field is 10 positions plus a decimal point using C#?

Posted on 2011-09-22
338 Views
I am developing a C# Console application using Visual Studio 2005.
My code is as follows in the code section:

How could I change the code so that the field is padded with zeroes to the left?
The field has to have a minimum length of 2.

For example: value =                  35 (input)
value = 00000000.35 (output should be 10 positions plus the decimal point)

``````if (reader.Name == "csc:amount")
{
arr1[i, 9] = "GROUP_FIELD_NAME:CheckAmount";

if (value.Length >= 2)
{
Int64 intTest = 0;
if (Int64.TryParse(value, out intTest) && intTest > 0)
arr1[i, 10] = "GROUP_FIELD_VALUE:" + value.Insert(value.Length - 2, ".");
else
{
arr1[i, 10] = "GROUP_FIELD_VALUE:" + value.Insert(value.Length - 2, ".");
sw1.WriteLine("GROUP_FIELD_NAME:ItemSequence:" + itemsequence + ",GROUP_FIELD_NAME:CheckAmount" + "," + "GROUP_FIELD_VALUE:" + value);
}
}
else
{
arr1[i, 10] = "GROUP_FIELD_VALUE:" + value;
sw1.WriteLine("GROUP_FIELD_NAME:ItemSequence:" + itemsequence + " Field CheckAmount has to be a minimum of 2 characters");
}
}
``````
0
Question by:zimmer9
• 3
• 3
• 2
• +1

LVL 9

Expert Comment

ID: 36583117
0

Author Comment

ID: 36583206
The value for the input field titled "value" can be any length between a
a minimum length of 2 and a maximum length of 10.
0

LVL 40

Expert Comment

ID: 36583370
value = 35; // or any input
value = ( "." + value ).PadLeft(11,'0');
0

Author Comment

ID: 36583489
Do you mean to modify as follows?
If I do, then initiial value = 0000185512 will result in value = .0000185512

if (value.Length >= 2)
{
Int64 intTest = 0;
if (Int64.TryParse(value, out intTest) && intTest > 0)
{
value = ("." + value).PadLeft(11, '0');
arr1[i, 10] = "GROUP_FIELD_VALUE:" + value;
}

0

LVL 40

Expert Comment

ID: 36583700
Your sample value did not show that there could be zeros in front of the value. By looking closely, maybe you could also have spaces, so lets get rid of both first:

string value = "  000350876"; // or any input that has spaces and/or zeros at the begining
value = ( value.Trim ( ) ).TrimStart ( '0' );
value = ( "." + value ).PadLeft(11,'0');
0

Author Comment

ID: 36583879
string value = "35"; // or any input that has spaces and/or zeros at the begining
value = ( value.Trim ( ) ).TrimStart ( '0' );
value = ( "." + value ).PadLeft(11,'0');
00000000.35    works fine

However
string value = "0000185512"; // or any input that has spaces and/or zeros at the begining
value = ( value.Trim ( ) ).TrimStart ( '0' );
value = 185512  <---     RESULT
value = ( "." + value ).PadLeft(11,'0');
0000.185512     <----    RESULT     should be 1855.12   WRONG RESULT
0

LVL 40

Expert Comment

ID: 36584598
You might understand what you need, but you communicate it very badly.

For example: value =                  35 (input)
value = 00000000.35 (output should be 10 positions plus the decimal point)

RESULT     should be 1855.12   WRONG RESULT

How come that you want 10 positions for 35, but only 6 for 185512?
How come that you want the extra zeroes on 35, but not on 185512?
Where did you specify that you always wanted only 2 decimals?

If the code you posted was not giving you the results you wanted, if was useless for me to look at it, so I answered to the sample input and output given in the first post. When you told me that this was not good for another input, without telling me the result you wanted, I gave you something that gave the same kind of result for both values. Once again, if your code did not do the work, it was useless for me to try to understand it.

State you needs clearly, and you will have an answer that works for all situations. Keep changing the relation between input and output, or giving incomplete information, and we will be at it for days.
0

LVL 33

Accepted Solution

Todd Gerbert earned 500 total points
ID: 36584979
Use Double.TryParse() to convert the string into a number. Divide that number by 100 to put a decimal point two digits in from the right. Double.ToString() can be used to output the number to a string with a specific number of digits.

http://msdn.microsoft.com/en-us/library/system.double.tryparse.aspx
http://msdn.microsoft.com/en-us/library/kfsatb94.aspx

``````using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

class Program
{
static void Main(string[] args)
{
string userInput = String.Empty;
double value;

// Get a string from the user that represents a number
Console.Write("Enter a number: ");

// Try to convert the string to a double
if (!Double.TryParse(userInput, out value))
{
Console.WriteLine("You didn't enter a valid number. Press any key to exit.");
Environment.Exit(1);
}

// Divide the number by 100 to put a decimal point
// two digits in from the right
value = value / 100;

// Output the result using Double.ToString()
Console.WriteLine(value.ToString("0000000000.00"));

// Another way to output the number as string...
Console.WriteLine("{0:0000000000.00}", value);

Console.Write("Press any key to exit...");
Environment.Exit(0);
}
}
``````
0

LVL 33

Expert Comment

ID: 36584989
Output from a couple tests...
``````Enter a number: 12
User input: 12
Result: 0000000000.12
Press any key to exit...
``````

``````Enter a number: 123456
User input: 123456
Result: 0000001234.56
Press any key to exit...
``````

``````Enter a number: 1234567890
User input: 1234567890
Result: 0012345678.90
Press any key to exit...
``````

This one comes out a little funky because the number is so big and the division by 100 results in a weird result - but if your numbers don't ever get this big it shouldn't be an issue.
``````Enter a number: 1122334455667788
User input: 1122334455667788
Result: 11223344556677.90
Press any key to exit...
``````
0

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