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+{{keywords>wiki library source code example reference}}
+===== atan =====
+<code c>
+    double atan(double);
+</code>
+calculates acustangens from a number
+===== C Sourcecode Example =====
+compile in linux with: gcc atan.c -o atan **-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=0.2;
+    printf("atan from %f is %f\n", a, atan(a) * 90 / 3.17);
+    return 0;
+}
+</code>
+===== output =====
+    output:
+    user@host:~$ ./atan
+    atan from 1.200000 is 24.872311

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