DaniWeb Forum Index > Software Development > C

Problem with working with math in C

Please support our C advertiser: Programming Forums - DaniWeb Sister Site

•

Join Date: Sep 2004

Posts: 5

Reputation: ray96 is an unknown quantity at this point

Solved Threads: 0

ray96

Offline

Newbie Poster

Problem with working with math in C

Sep 27th, 2004

Hi, I am very new to C, and also to this forum, so please bear with me. :!: :o I am trying to create a console astronomical program, and I need to know how to convert radian numbers to degrees. I would appreciate any help.

•

Join Date: Sep 2004

Posts: 185

Reputation: Stack Overflow is an unknown quantity at this point

Solved Threads: 4

Stack Overflow Stack Overflow is offline

Offline

C Programmer

Re: Problem with working with math in C

Sep 28th, 2004

Greetings ray96,

Mathematics in C is not difficult to use. For example, lets take this word problem for example:

Note: Since 360° = 2 radians, then 180° = radians.
We will use this fact to convert between degrees and radians.

» Convert 5/12 radians to degrees.
Lets take a simple approach:

Step 1: 5 rads / 12
Step 2: 180 degs / rads

Step 3: 5 x 180degs / 12
Step 4: 75 degrees

Doing this in C wont be hard at all:

Help with Code Tags

(Toggle Plain Text)

int radToDegrees(int radians) {
	float s1;

	s1 = (radians * 180.0f) / 12.0f;

	return (int)s1;
}

This algorithm may not be perfect, but its a good start. If you have any further questions please feel free to ask.

- Stack Overflow

Following the rules will ensure you get a prompt answer to your question. If posting code, please include BB [code][/code] tags. Your question may have been asked before, try the search facility.

IRC
Channel: irc.daniweb.com
Room: #c, #shell

•

Join Date: Apr 2004

Posts: 4,438

Reputation: Dave Sinkula has a brilliant future

Solved Threads: 249

Dave Sinkula Dave Sinkula is offline

Offline

long time no c

Re: Problem with working with math in C

Sep 28th, 2004

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
#include <math.h>
 
 double degrees_to_radians(double degrees)
 {
    double PI = 4.0 * atan(1.0);
    return degrees * PI / 180.0;
 }
#include <math.h>
 
 double degrees_to_radians(double degrees)
 {
    double PI = 4.0 * atan(1.0);
    return degrees * PI / 180.0;
 }

"One of the methods used by statists to destroy capitalism consists in establishing controls that tie a given industry hand and foot, making it unable to solve its problems, then declaring that freedom has failed and stronger controls are necessary." --Ayn Rand