sin (radians -> grades)

[Gugge]

When you calc with sin you get the result in radians.
What do I do, if i want to calc with sin, and get the result in grades.
Can it be done??

[neandrake]

what are grades? is that degrees? if so, you multiply the number in radians by 180/PI

[Unregistered]

grade or grad?

[Unregistered]

Conversion is 360° = 2pi rad = 400 grad, if this is what you are looking for. If not, more info please.

[Gugge]

When i calc sin(65) on my calculater i'll get 0,90630778 and when I calc in c witg (rad) I get 0,826828.
Is not degrees, but when you are using the (one) cirkel with cosinus & sinus, i dont know the engelsk word for it).
You are using it, when you teach what sin & cos are, and there is a cirkel with radius 1.

Hope you can understand this..:-)

tx
Gugge

[Unregistered]

sin 90 degrees = 1.0
sin 100 grads = 1.0
sin 1.570796327 rads = 1.0
Where are you from?
circle = 360 degrees
circle = 400 grads
circle = 2 * pi rads = 6.283185307 rads
a rad is roughly 57.3 degrees

[bljonk]

maybe u are just entering the values in DEGREES instead of entering the in RADIANS to the program;

sin(double radians); //where radians is the value of an angle but expressed in radian not in degrees, otherwise you will never get the right value back to u.

this macro should do u a big help:

#define _RAD(x) (x) *(0.017453292) //will convert degrees to radians, but you should write a function to do it for you; more secure and bug free.

[Gugge]

tx foir all you answers i figured it out, and now my program i working prb...tx...