// This application demonstrates how to use a stringstream object to read
// individual "words" or tokens from a string 
// It also deomonstrates Standard C vs C++ Standard header file directives

#define _USE_MATH_DEFINES
#include <math.h>	// old C-style header from Standard C Library
//#include <cmath>	// new C++ style header from C++ Standard Library

#include <iostream>	// only in C++ Standard Library
#include <iomanip>
#include <sstream>
#include <ctype.h>

using namespace std;

int main(int argc, char* argv[] )
{
	string userInput;	// user input from keyboard
	cout << "enter a string" << endl;
	getline(cin, userInput );

	istringstream instr(userInput);	// a stream object used to read the input string
	string substring;	// substring of user input
	do {				// iterate through the user input string
		instr >> substring;	// get a word from the user input string
		cout << substring;	

		isalpha( substring[1] );

	} while(!instr.eof() );	// repeat until end of string

	float x = -M_PI;	// from math.h or cmath; must #define _USE_MATH_DEFINES for M_PI
	x = fabs(x);	    // from math.h or cmath


	return EXIT_SUCCESS;
}