#include <iostream.h>
#include <math.h>

// file: math.cc
// demonstrate use of library math functions
// functions that return values


int main()
{
   double number;

   cout << "Enter a number: ";
   cin >> number;

   cout << "The sine of " << number << " is "
      << sin(number) << endl;
   cout << "The cosine of " << number << " is "
      << cos(number) << endl;
   cout << "The square root of " << number << " is "
      << sqrt(number) << endl;
   cout << "The ceiling of " << number << " is "
      << ceil(number) << endl;
   cout << "The floor of " << number << " is "
      << floor(number) << endl;

   return 0;
}

Sample output:

< math
><Enter a number: 3.1416
> The sine of 3.1416 is -7.34641e-06
> The cosine of 3.1416 is -1
> The square root of 3.1416 is 1.77246
> The ceiling of 3.1416 is 4
> The floor of 3.1416 is 3

< math
><Enter a number: 3.14159265
> The sine of 3.14159 is 3.58979e-09
> The cosine of 3.14159 is -1
> The square root of 3.14159 is 1.77245
> The ceiling of 3.14159 is 4
> The floor of 3.14159 is 3

< math
><Enter a number: 256
> The sine of 256 is -0.999208
> The cosine of 256 is -0.0397908
> The square root of 256 is 16
> The ceiling of 256 is 256
> The floor of 256 is 256