csharp and vb got different result in math calculation WHY??????

[Nicolas]

Why does for the same code I got different result
the VB code gave me what I want why not the csharp?

Thank you for your help...

CSHARP CODE
int sx, sy;
double sdegrees;

sdegrees = (90 - (5/15) * 90) * (System.Math.PI / 180);

sx = (int) System.Math.Round(95 * System.Math.Cos(sdegrees));

sy = (int) -(System.Math.Round(95 * System.Math.Sin(sdegrees)));

MessageBox.Show(sdegrees.ToString() + "\n" + sx.ToString() + "\n" +
sy.ToString());
VB CODE

Dim sx, sy As Integer

Dim sdegrees As Double

sdegrees = (90 - (5 / 15) * 90) * (System.Math.PI / 180)

sx = System.Math.Round(95 * System.Math.Cos(sdegrees))

sy = -(System.Math.Round(95 * System.Math.Sin(sdegrees)))

MessageBox.Show(sdegrees.ToString + vbCr + sx.ToString + vbCr + sy.ToString)

[David Browne]

"Nicolas" <nl*****@hotmail.com> wrote in message
news:uj**************@TK2MSFTNGP12.phx.gbl...

Why does for the same code I got different result
the VB code gave me what I want why not the csharp?

Thank you for your help...

Because "/" is a different operator in VB than in C#.

In VB "/"

Divides two numbers and returns a floating-point result.
In C# "/"

The division operator (/) divides its first operand by its second. All
numeric types have predefined division operators.

Which means that in VB the the operands to "/" are converted to
floating-point types before the operator operates on them. In C# the the
operands are not converted. That means in C# when "/" operates on 2 int32's
the result is an int32. It's integer division. And so 5/15=0.

In VB 5/15 = 5.000/15.000 = 0.3333. VB uses "\" for integer division
because it's a very helpful language. C# assumes that you know what you're
doing and know that your literals will be evaluated as integers, and that
when you write 5/15, you really want 0.

David

[Nicolas]

Thanks a lot and it works now and you're right, I'm new in cSharp.

"David Browne" <davidbaxterbrowne no potted me**@hotmail.com> wrote in
message news:eo**************@TK2MSFTNGP10.phx.gbl...

"Nicolas" <nl*****@hotmail.com> wrote in message
news:uj**************@TK2MSFTNGP12.phx.gbl...

Why does for the same code I got different result
the VB code gave me what I want why not the csharp?

Thank you for your help...

Because "/" is a different operator in VB than in C#.

In VB "/"

Divides two numbers and returns a floating-point result.
In C# "/"

The division operator (/) divides its first operand by its second. All
numeric types have predefined division operators.

Which means that in VB the the operands to "/" are converted to
floating-point types before the operator operates on them. In C# the the
operands are not converted. That means in C# when "/" operates on 2

int32's the result is an int32. It's integer division. And so 5/15=0.

In VB 5/15 = 5.000/15.000 = 0.3333. VB uses "\" for integer division
because it's a very helpful language. C# assumes that you know what you're doing and know that your literals will be evaluated as integers, and that
when you write 5/15, you really want 0.

David