/* an example on using math functions in C++ */

#include <cmath>
#include <iostream> 
using namespace std; 

/* define the constant pi */ 
const double PI = acos(-1.0); 
 
int main() 
{
  /* Declare variables.  */ 
  double x, y, z;

  cout << "absolute value of -3.4 =" << abs(-3.4) <<endl;

  cout << "pow(0,-3.4) =" << pow(0,-3.4) <<endl;

    cout << "pow(-1.0,0.5) =" << pow(-1.0,0.5) <<endl;

    cout << "pow(-1.0,2.0/3.0) =" << pow(-1.0,2.0/3.0) <<endl;

  cout << "pow(4.0,.5) =" << pow(4.0,.5) <<endl;

  return 0;

}