The compiler creates a default construtor only in the following situations:

* When the class's base class defines the default constructor.
* When the class of member objects defines default constructors.
* When the class has a virtual function.
* When the class has a virtual base class.

So for the following class, the compiler does not create a defalut constructor if you do not define one:

Code:
class test
{

	public:
		void show();
		void get(int, char*, float);
	private:
		int h,
		char* ch;
		float f;
};