[RESOLVED] VB6 facing problems with Sine and Cosine

[k80sg]

I was translating some codes from C++ to vb6 and I notice the results output when using sine or cosine is different for instance, sin(0.224654) will yield a result of 0.222769 when it should be 0.0039209. Any idea why?

Thanks.

[Siddharth Rout]

But Sine of 0.224654 is 0.222769070022729

[westconn1]

?sin(.224654 *3.14159265/180)
 3.92094192660541E-03

?cdec(sin(.224654 *3.14159265/180))
 0.00392094192660541

it does not quite match the value using excel worksheet functions

[k80sg]

?sin(.224654 *3.14159265/180)
 3.92094192660541E-03

?cdec(sin(.224654 *3.14159265/180))
 0.00392094192660541

it does not quite match the value using excel worksheet functions

Sorry I am a little confused here, so which is which?

[Siddharth Rout]

Sin(0.224654) in vb6 and sin(0.224654) in Excel both give me 0.222769070022729

[k80sg]

Sin(0.224654) in vb6 and sin(0.224654) in Excel both give me 0.222769070022729

Hmm..when I work in C++ it gives me 0.0039209419... same when I use my window xp calculator.

[Siddharth Rout]

Yes that's because what you pass to sin is very imp.

Sin returns the sine of the given angle(Radians). if 0.224654 is an angle(Radians) then 0.222769070022729 is correct but if 0.224654 is degrees then you need to change it to angle(Radians) and then 0.0039209 is correct...

1 radian = 57.2957795 degrees

So

Format(Sin(0.224654 / 57.2957795), "0.0000000") will give you 0.0039209

[k80sg]

Yes that's because what you pass to sin is very imp.

Sin returns the sine of the given angle(Radians). if 0.224654 is an angle(Radians) then 0.222769070022729 is correct but if 0.224654 is degrees then you need to change it to angle(Radians) and then 0.0039209 is correct...

1 radian = 57.2957795 degrees

So

Format(Sin(0.224654 / 57.2957795), "0.0000000") will give you 0.0039209

Thanks a lot for the explanation!

[Siddharth Rout]

Kool. If your query is solved then do remember to mark the thread resolved Check my signature on how to mark a thread resolved

[westconn1]

Sorry I am a little confused here, so which is which?

the return from sin is a double
first example
by type casting to decimal you get the returned value as a decimal value
both are equal

sid converted the return to a formatted string, but i prefered to keep as a value