A Constructor is called when you are making a new instance of a class and member functions are functions that you can call within your class or else call using the instance of that class.
for example
class Foo {
public:
int bar;
Foo(int bar) {this->bar = bar;}
inc_bar(); {this->bar++;}
};
Foo instance(10); // Constructor is called and bar is set to 10
cout << instance.bar << endl;
instance.inc_bar(); // call the member function to increment bar
cout << instance.bar << endl;
Constructor creates an instance of class, destructor destroys it.
A constructor creates the initial state of a collection of data. A function modifies or queries the data after it has been initialized.
A constructor is a method that fires when the object is instantiated. A friend function is a function that has special access to the object. They are two different types of things, and cannot be further differenced.
An implicit constructor call will always call the default constructor, whereas explicit constructor calls allow to chose the best constructor and passing of arguments into the constructor.
True - A C++ constructor cannot return a value.
Private construction prevents objects from the class from being instantiated other than via a static member function of the class, a friend function or a friend class.
There is no such thing as a constructor function in C++ (constructors have no return value, not even void, and cannot be called like regular functions). Constructors are invoked rather than called directly, either by declaring a static variable of the class type, or via the C++ new operator.
A constructor is a method that fires when the object is instantiated. A friend function is a function that has special access to the object. They are two different types of things, and cannot be further differenced.
An implicit constructor call will always call the default constructor, whereas explicit constructor calls allow to chose the best constructor and passing of arguments into the constructor.
True - A C++ constructor cannot return a value.
Private construction prevents objects from the class from being instantiated other than via a static member function of the class, a friend function or a friend class.
You need to #include the header file that contains the missing function's declaration.
There is no such thing as a constructor function in C++ (constructors have no return value, not even void, and cannot be called like regular functions). Constructors are invoked rather than called directly, either by declaring a static variable of the class type, or via the C++ new operator.
use the _itoa function
For gcc there's a non-standard solution. Declare the function with __attribute__((constructor)) (note the double parentheses). Like this: void init(void) __attribute__ ((constructor)); void init(void) { // your code goes here } Starting with gcc 4.3 there's even a possibility to assign a priority to the "constructor". See http://gcc.gnu.org/onlinedocs/gcc-4.3.0/gcc/Function-Attributes.html for details.
Java doesn't have pointers. C++ has pointers.
Yes.
It is not a reserved word, so can be an identifier (name of a type/variable/function).
B. Class.