// This program illustrates the difference between declaring
// variables in a class vs. in the main program.
// Classes set all numeric values to 0 and all pointers to NULL
// during declaration.  In the main program, c-strings and numeric
// values that are uninitialized will be undefined and contain garbage.
// But since strings are objects, they will be set to NULL, meaning they are empty.

#include<iostream>
using namespace std;
class testclass
{
	public:
		string a;  // unintialized, but will be empty
		char b[9];  
		char c[]; // cannot initialize variables in class variable declaration
		int d;
		float e;
		int f;
};
testclass tclass;
int main()
{
	string a;  // unintialized, but will be empty
	char b[9];  // warning - unintialized and contains garbage
	char c[]="some text";
	int d;
	float e;
	int f;	

	cout << "tclass.a is " << tclass.a << "\ntclass.b is " << tclass.b << "\ntclass.c is " << tclass.c <<
		"\ntclass.d is " << tclass.d << "\ntclass.e is " << tclass.e << "\ntclass.f is " << tclass.f <<  endl;
		
	cout << "\na is " << a << "\nb is " << b << "\nc is " << c 
	<< "\nd is " << d << "\ne is " << e << "\nf is " << f<< endl;
	system("pause");
}