//libr-fns.cpp
//how to call functions in the standard libraries

#include <iostream>
#include <cstdlib>   //for rand()
#include <cmath>     //for floor(), pow()
using namespace std;

const double PI = 3.14159;

int main(){
  double x1 = 2.0, x2 = 3.0, x3;    

  cout << showpoint << 1234.56789 << endl
       << rand() % 6 + 1 << endl;

  cout << pow(2.0, 3.0)  << endl              //args are constants
       << pow(x1, x2)             << endl     //args are variables
       << pow(x1 * 2.0, x2 - 1)   << endl     //args are expressions
       << pow(x1, floor(PI))      << endl     //args are expressions
       << pow(pow(x1, x2), floor(PI) - 1)     //args are expressions
       << endl; 

  //using library functions in assignment statement
  x3 = 2 * (pow(floor(PI), (rand() % 6 + 1)));
  cout << x3 << endl;

  cout << "Exiting.." << endl;
  return 0;
}