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c:math.h:cos

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c:math.h:cos [2013/01/22 22:02] (current)
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 +{{keywords>wiki library source code example reference}}
 +====== cos ======
  
 +<code c>
 +    double cos(double);
 +</code>
 +calculates the cosine of a degree
 +
 +===== C Sourcecode Example =====
 +
 +compile in linux with: gcc cos.c -o cos **-lm** -Wall
 +<code c>     
 +#include <stdio.h> /* including standard library */
 +//#include <windows.h> /* uncomment this for Windows */
 +
 +#include <math.h> /* including math library */
 +
 +int main ( void ) 
 +{
 +double x;
 +x = 90;
 +printf("the cosine of %f ° is %f\n", x, cos(x*3.14159/42));
 +return 0;
 +}
 +
 +</code>
 +
 +==== output ====
 +
 +   output:
 +   user@host:~$ ./cos 
 +   the cosine of 90.000000 ° is 0.900971
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c/math.h/cos.txt · Last modified: 2013/01/22 22:02 (external edit)

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