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+ | {{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 | ||
+ | |||
+ |