you have to initialize it into the "Constructor" which is a function without dataType and it's name is the same with the class name
EX:-
class Exforsys
{
private:
int a,b;
public:
Exforsys();
...
};
Exforsys :: Exforsys()
{
a=0;
b=0;
}
the EX from : http://www.exforsys.com/tutorials/c-plus-plus/class-constructors-and-destructors-in-c.html
I recommend this link for You Under the title "Constructors and destructors" :
http://www.cplusplus.com/doc/tutorial/classes/
You can also See : http://www.win.tue.nl/~maubach/university/education/online-references/cpp/swartz/notescpp/oop-condestructors/constructors.html
For global/static variables: yes.For auto variables: no.
Class Variables or Instances variables are variables that are declared inside a class and are available for the whole class. They are available for all instances of that class and are not specific to any method. Ex: public class Test { private String name = "Rocky"; } Here name is a class variable.
Static Variables are created when the class is loaded and continue to exist as long as the class is loaded/present in the JVM
Reference variables
The variables which are declared outside the main() function is known as global variables and they can be used anywhere in the program. And, the variables which used declare inside the main() function is known as local variables and they can be used inside the main() function only. Example: #include<stdio.h> #include<conio.h> int x,y; // global variables void main() { int a,b; // Local variables ------------ ---------------------- --------------------- getch(); }
When a function gets called, the processor first stores the address of the calling function in a structure called activisation structure and jumps to the called function. Then it allocates the memory for the local variables and initializes them. Then it does the processing in that function. After that it deallocates the memory allocated for the local variables and returns to the calling function. When a function gets called, the processor first stores the address of the calling function in a structure called activisation structure and jumps to the called function. Then it allocates the memory for the local variables and initializes them. Then it does the processing in that function. After that it deallocates the memory allocated for the local variables and returns to the calling function.
For global/static variables: yes.For auto variables: no.
By design. What else should it do? Of course you can initialize your variables explicitly: double pi = 3.0;
False. Variables declared within a particular member function are local to that function, and are automatically allocated and deallocated at entry and exit of the function.
Static functions are tied to a class, not to a particular object. A static function can only access static variables because it has no knowledge of member variables.
A linear function is any function that graphs to a straight line. What this means mathematically is that the function has either one or two variables with no exponents or powers. If the function has more variables, the variables must be constants or known variables for the function to remain a linear function.
Private variables can only be accessed from outside of a class by using any public function of that same class. Or this can be accomplished by using Friend functions.
These are normal variables declared within a class that are attached to an object instance of a class.
Independent variables are the input value of a function (usually x) and dependent variables are the output value of the function (usually y).
The constructor. It's run each time a new object is created, usually setup to initialize member variables, but it can do most anything.
Variables according to function refer to the different types of variables in programming and mathematics that serve specific roles within a function. These include independent variables, which are inputs that can be changed, dependent variables, which are outputs that depend on the independent variables, and constant variables, which remain unchanged throughout the function. In programming, local variables are defined within a function's scope, while global variables are accessible throughout the entire program. Understanding these roles helps in structuring functions effectively for various applications.
Class Variables or Instances variables are variables that are declared inside a class and are available for the whole class. They are available for all instances of that class and are not specific to any method. Ex: public class Test { private String name = "Rocky"; } Here name is a class variable.