Calculates the hyperbolic cosine function of a double precision floating-point value.
Include
<math.h>
Prototype
double cosh (double x);
Argument
x
Return Value
Returns the hyperbolic cosine of x
.
Remarks
A range error will occur if the magnitude of x
is too
large.
Example
#include <math.h>
#include <stdio.h>
#include <errno.h>
int main(void)
{
double x, y;
errno = 0;
x = -1.5;
y = cosh (x);
if (errno)
perror("Error");
printf("The hyperbolic cosine of %f is %f\n", x, y);
errno = 0;
x = 0.0;
y = cosh (x);
if (errno)
perror("Error");
printf("The hyperbolic cosine of %f is %f\n", x, y);
errno = 0;
x = 720.0;
y = cosh (x);
if (errno)
perror("Error");
printf("The hyperbolic cosine of %f is %f\n", x, y);
}
Example Output
The hyperbolic cosine of -1.500000 is 2.352410
The hyperbolic cosine of 0.000000 is 1.000000
Error: range error
The hyperbolic cosine of 720.000000 is inf