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--- c:math.h:acos [2013/01/22 22:02]
+++ c:math.h:acos [2024/02/16 01:05] (current)
@@ Line 1: / Line 1: @@
+{{keywords>wiki library source code example reference}}
+===== acos =====
+<code c>
+    double acos(double);
+</code>
+   calculates arccosine
+Linux: compile with gcc acos.c -o acos **-lm** -Wall
+===== C Sourcecode Example =====
+<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("acos from %f is %f\n", a, acos(a) * 90 / 3.17);
+    return 0;
+}
+</code>
+===== output =====
+    user@host:~$ ./acos
+    acos from 0.200000 is 38.879955

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