C# string conversion to integer and compare

Question

hi im getting this error while converting strings to int

string oneamount = "1200.12366";
string twoamount = "121.11";
int x=Int32.Parse(oneamount);
int y = Int32.Parse(twoamount);

      
            if (x > y)
            {
                Console.WriteLine("okay");
            }

Error input string was not in correct format

Is `121.11` an integer / `Int32` ? I can assure you its not, now the next question is what type could it be? — TheGeneral, Oct 01 '20 at 02:49
@Raju [Integer](https://en.wikipedia.org/wiki/Integer): _"An integer is colloquially defined as a number that can be written without a fractional component. For example, 21, 4, 0, and -2048 are integers, while 9.75, 5½, and √2 are not."_ — ProgrammingLlama, Oct 01 '20 at 03:12
thanks everyone out there for your valuable time.. got solution.........:) :) — Raju Lama, Oct 01 '20 at 03:31
Why do you want to compare integers when you have decimals? Do you want to just compare the non-decimal component? Or do you want to round correctly? — Jon P, Oct 01 '20 at 03:32

score 1 · Answer 1 · answered Oct 01 '20 at 02:56

Please try Int32.TryParse function. It converts the string representation of a number to its 32-bit signed integer equivalent. A return value indicates whether the operation succeeded.

Int32.TryParse Method

Signature is:

public static bool TryParse (string s, out int result);

Example:

using System;

public class Example
{
   public static void Main()
   {
      String[] values = { null, "160519", "9432.0", "16,667",
                          "   -322   ", "+4302", "(100);", "01FA" };
      foreach (var value in values)
      {
         int number;

         bool success = Int32.TryParse(value, out number);
         if (success)
         {
            Console.WriteLine("Converted '{0}' to {1}.", value, number);
         }
         else
         {
            Console.WriteLine("Attempted conversion of '{0}' failed.",
                               value ?? "<null>");
         }
      }
   }
}
// The example displays the following output:
//       Attempted conversion of '<null>' failed.
//       Converted '160519' to 160519.
//       Attempted conversion of '9432.0' failed.
//       Attempted conversion of '16,667' failed.
//       Converted '   -322   ' to -322.
//       Converted '+4302' to 4302.
//       Attempted conversion of '(100);' failed.
//       Attempted conversion of '01FA' failed.

Once you have correct value in your integer, then you can compare them to see whether or nor your operation succeeded.

string oneamount = "1200.12366";
int oneAmountInt32;
string twoamount = "121.11";
int twoAmountInt32;
Int32.TryParse(oneamount, out oneAmountInt32);
Int32.TryParse(twoamount, out twoAmountInt32);

      
if (oneAmountInt32 > twoAmountInt32)
{
    Console.WriteLine("okay");
}

score 0 · Accepted Answer · edited Oct 01 '20 at 04:11

expounding on @MichaelRandall's comment.

Integers are whole number/no decimal place. If you want to compare with decimal, use double, float, decimal

you can convert the string values into decimal for precision purposes

string oneamount = "1200.12366";
string twoamount = "121.11";
var x = Convert.ToDecimal(oneamount);
var y = Convert.ToDecimal(twoamount);

      
            if (x > y)
            {
                Console.WriteLine("okay");
            }

C# string conversion to integer and compare

2 Answers2