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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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