double sinh(double);

return the hyperbolic sinus

compile in linux with: gcc sinh.c -o sinh -lm -Wall

#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 = log(4.2);
  printf ("hyperbolic sine of %lf is %lf\n", x, sinh(x) );
  return 0;
}

 output:
 user@host:~$ ./sinh 
 hyperbolic sine of 1.435085 is 1.980952