# How to Find the number zero in decimal part where add no value to the number and remove that part

I am using the following code to convert cm to the meter.

`````` public static double? ConvertCmToM(double? cm)
{
return cm.Value * 0.01;

}
``````

When I input the number 8.8 output giving as

0.08800000000000001m

But I want to stop in the index where zero adds no value in the decimal part. In this case I want to display the value as

0.088m

This is already done in major converter websites. when you type the cm to m converter on google those sites will appear. How do they do it?

I took the same sample and put in their sites and this is how they show.

``````> 0.088m
``````

I cannot blindly substring the value after converting to a string as the zero part will appear in 5th or 6th element.
That also handled in those sites.

This is a double data type. the letter "m" concat at the last minute. How to acehive this?

### >Solution :

I would use decimal instead of double then:

``````public static decimal? ConvertCmToM(decimal? cm)
{
if(cm == null) return null;
return Decimal.Multiply(cm.Value, 0.01m);
}

static void Main()
{
Console.Write(ConvertCmToM(8.8m)); // 0.088
}
``````

decimal vs double! – Which one should I use and when?