CODEWITHSUNDEEP
c#-4.0biginteger
Majid Shahabfar
Majid Shahabfar

Reputation: 4829

Converting small number to BigInteger type in C#

I need to convert small number to a BigInteger type but it results zero. consider following code:

BigInteger x = new BigInteger(0.6);
var res = BigInteger.Pow(x, 10) / Factorial(30);

in the first line 0.6 conversion to BigInteger results zero and the entire code return wrong result. any idea?

Upvotes: 1

Views: 150

Answers (2)

Dummy01
Dummy01

Reputation: 1995

The integer part of 0.6 is 0 so the result is correct.

if you want use Math.Round() to convert to the rounded integer which in your case is 1.

BigInteger x = new BigInteger(Math.Round(0.6));

Upvotes: 1

user5398447
user5398447

Reputation:

From: http://msdn.microsoft.com/en-us/library/system.numerics.biginteger.aspx

"Floating-point values are truncated before they are assigned to the BigInteger." Hence, see the following code snippet (from source):

BigInteger bigIntFromDouble = new BigInteger(179032.6541);
Console.WriteLine(bigIntFromDouble);
// The example displays the following output: 
//   179032

As a result, your BigInteger x = new BigInteger(0.6); results zero because of the truncate...which is expected behavior.

Upvotes: 0

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