使用正确的小数点将字符串值转换为十进制

Question

i have value stored in string format & i want to convert into decimal.

ex:

i have 11.10 stored in string format when i try to convert into decimal it give me 11.1 instead of 11.10 .

I tried it by following way

string getnumber="11.10";
decimal decinum=Convert.ToDecimal(getnumber);

i tried this also

decinum.ToString ("#.##");

but it returns string and i want this in decimal.

what could be the solution for this?

Answer 1

As already commented 11.1 is the same value as 11.10

decimal one=11.1;
decimal two=11.10;
Console.WriteLine(one == two);

Will output true

The # formatter in the to string method means an optional digit and will supress if it is zero (and it is valid to suppress - the 0 in 4.05 wouldn't be suppressed). Try

decinum.ToString("0.00"); 

And you will see the string value of 11.10

Ideally you actually want to use something like

string input="11.10";
decimal result;

if (decimal.TryParse(input,out result)) {
   Console.WriteLine(result == 11.10);
} else {
  // The string wasn't a decimal so do something like throw an error.
}

At the end of the above code, result will be the decimal you want and "true" will be output to the console.

Answer 2

this will work perfectly

string getnumber = "11.10";
decimal decinum = Math.Round(Convert.ToDecimal(getnumber), 2);

Answer 3

A decimal datatype stores a value . The value of 11.1 is identical to that of 11.10 - mathemtically, they're the exact same number, so it's behaving properly.

What you seem to want is to display the number as 11.10, but that's up to the code that displays it - I don't know if you're writing to log file, displaying on a web-page or any other format - but that is independent of the internal representation of the decimal datatype.

Answer 4

there is no solution, This is expected behaviour. 11.10 in string = 11.1 in number

you cant store zeros on the decimal part, otherwise 11.10 would be different than 11.100 , which is true if you are talking about strings but not if you are talking about numbers.

I think your problem is on a presentation level only. Why dont you explain better what you want to do.

Answer 5

11.10 expressed as a decimal is 11.1, just like it is 11.100000000000000000000000000000000000.

For mathematical processes, don't worry about how it displays itself. If you are displaying the value then converting it into a string is no biggie either. Remember that

decinum.ToString ("#.##");

is returning a string (from the 'ToString' function) and not converting the 'decinum' to a string.

Answer 6

    string getnumber = "11.10";
    double decinum = double.Parse(getnumber);