Thread: Fortran to C - dsin

Hi everyone,

I know this is the C board but hopefully someone can help.

I've been tasked with converting a FORTRAN program to C and am having problems with the 'DSIN' function, for example:

Code:

S         = DSIN(THETA)

Where theta is 0.104, for example. Generally sin (0.104) is 0.104
.
I've found out the D means degrees.

My question is, converting from FORTRAN to C, should I use

Code:

S = sin(theta)
or 
S = sin((180/pi)*theta)

to get the same as the FORTRAN? The FORTRAN output appears to be the same as the first option, which would surely mean the 'D' bit of 'DSIN' is pointless?

*confused*

Originally Posted by snoikey

I've found out the D means degrees.

In a quick search of the internet, it would appear to me that the D means double precision and not degrees.

It looks like you're right, thank you! Trying to find the website I got 'degrees' from I can't.. oh well, thank you!