ILE C/C++ Run-Time Library Functions


cos() -- Calculate Cosine

Format

#include <math.h>
double cos(double x);

Language Level: ANSI

Threadsafe: Yes.

Description

The cos() function calculates the cosine of x. The value x is expressed in radians. If x is too large, a partial loss of significance in the result may occur.

Return Value

The cos() function returns the cosine of x. The value of errno may be set to either EDOM or ERANGE.

Example that uses cos()

This example calculates y to be the cosine of x.


#include <math.h>
#include <stdio.h>
 
int main(void)
{
   double x, y;
 
   x = 7.2;
   y = cos(x);
 
   printf("cos( %lf ) = %lf\n", x, y);
}
 
/*********************  Output should be similar to:  *******************
 
cos( 7.200000 ) = 0.608351
*/

Related Information


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