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c:math.h:atan2

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c:math.h:atan2 [2013/01/22 22:02] (current)
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 +{{keywords>wiki library source code example reference}}
 +===== atan2 =====
 +
 +<code c>
 +    double atan2(double , double );
 +</code>
 +calculates arctangent from 2 numbers
 +
 +===== C Sourcecode Example =====
 +
 +compile in linux with: gcc atan2.c -o atan2 **-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 a=1.2, b=-2.6;
 +    printf("atan2 from %f and %f is %f\n", a, b, atan2(a, b) * 90 / 3.17);
 +    return 0;
 +}
 +</code>
 +===== output =====
 +
 +    output:
 +    cd@najai:~$ ./atan2
 +    atan2 from 1.200000 and -2.600000 is 76.916921
  
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c/math.h/atan2.txt · Last modified: 2013/01/22 22:02 (external edit)

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