Question

I have a need to convert one string to another string (4 character always) as follows:

1.2 > 0102
99.1 > 9901
1 > 0100
1.44 > 0144

and then some other function to convert back from one string (4 character always) to another something like:

0102 > 1.2
9901 > 99.1
0100 > 1
0144 > 1.44

Can someone help by giving some suggestions as to how I could do this in C#?

Update:

Just to make it a bit more clear. There are really two zero padded double digit numbers. The one before the decimal and the one after. So 90.09 would need to convert to “90” + “09” = “9009”. I hope this makes sense

Answer 1

I would use LINQ to solve it in one line:

string oldString = "3.5";    
string newString = string.Join("", from s in oldString.Split('.') select s.PadLeft(2, '0')).PadRight(4, '0');

Reverting is easier:

string oldString = "0305";
string newString = oldString.Substring(0,2).TrimStart('0') + "." + oldString.Substring(2,2).TrimStart('0');