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c:math.h:atan2 [2013/01/22 22:02] |
c:math.h:atan2 [2024/02/16 01:05] (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 | ||