Problem with Conversion in csharp

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C#

TimeSpan ts;
Single nomonths;
ts=startDate.Substract(endDate);
nomonths = Convert.toSingle(ts.days/30);  //ts.days=57

So in nomonths has to get 1.9 but it is showing 1

Please help me.

Posted 15-Feb-11 20:57pm

Sridhar Patnayak

Updated 16-Feb-11 6:08am

Henry Minute

v3

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2 solutions

Solution 2

This is a very basic programming error. Assuming you are a beginner I've choosen a special app name
for my example...

Read about implicit and explicit casting, basic datatypes and precision. These are topics you come across in every programming language - you have to know it!

using System;
namespace ReadChapterOneOfAnyNETBook
{
    class Program
    {
        static void Main(string[] args)
        {            
            DateTime startDate = DateTime.Now.AddDays(-57d);
            DateTime endDate = DateTime.Now;
            TimeSpan ts = endDate - startDate;
            float numberOfMonths = (float) ts.TotalDays / 30f;
            Console.WriteLine(numberOfMonths);
            Console.ReadKey();
        }
    }
}

Posted 16-Feb-11 4:27am

johannesnestler

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-02-15T21:01:00

No!

double nomonths = Convert.TotalDays / 30d;

Read System.TimeSpan help properly (http://msdn.microsoft.com/en-us/library/system.timespan.aspx[^]). Properties not prefixed with "Total" return integer value, but you need floating point.

Your problem was: division integer by integer gives you integer value converted to single. The fractional part was cut even before calling Convert function (which is totally redundant).

—SA