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c:math.h:cos [2024/02/16 01:05] (current) |
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+ | {{keywords>wiki library source code example reference}} | ||
+ | ====== cos ====== | ||
+ | <code c> | ||
+ | double cos(double); | ||
+ | </code> | ||
+ | calculates the cosine of a degree | ||
+ | |||
+ | ===== C Sourcecode Example ===== | ||
+ | |||
+ | compile in linux with: gcc cos.c -o cos **-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 x; | ||
+ | x = 90; | ||
+ | printf("the cosine of %f ° is %f\n", x, cos(x*3.14159/42)); | ||
+ | return 0; | ||
+ | } | ||
+ | |||
+ | </code> | ||
+ | |||
+ | ==== output ==== | ||
+ | |||
+ | output: | ||
+ | user@host:~$ ./cos | ||
+ | the cosine of 90.000000 ° is 0.900971 |