Problems with Very Large Numbers

[Jonathan]

My app is trying to multiply and add some very large numbers. Here is the line that I am am having problems with:

Seconds = CDbl(PartB) * CDbl(16777216)

Seconds is a double and PartB is a short. Partb is 15 before this line. After the multiplication, the value held in seconds is 549420. This obviously isn't correct. I know that the problem is the conversion between types and how much space vb.net uses for its evaluation. However, I'm not sure how to fix it. Any ideas? Thanks for the help.

[Ken Tucker [MVP]]

Hi,

I can't reproduce your error.
Dim PartB As Short = 15
Dim seconds As Double = CDbl(PartB) * CDbl(16777216)
Trace.WriteLine(seconds.ToString)

Trace.WriteLine(15 * 16777216)
Both methods return a value of 251658240.

Ken
--------------

"Jonathan" <Jo******@discussions.microsoft.com> wrote in message
news:36**********************************@microsof t.com:

My app is trying to multiply and add some very large numbers. Here is the
line that I am am having problems with:

Seconds = CDbl(PartB) * CDbl(16777216)

Seconds is a double and PartB is a short. Partb is 15 before this line.
After the multiplication, the value held in seconds is 549420. This
obviously isn't correct. I know that the problem is the conversion between
types and how much space vb.net uses for its evaluation. However, I'm not
sure how to fix it. Any ideas? Thanks for the help.

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