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What is the difference between a static variable a global variable and a local variable?
A static variable is a variable allocated in static storage. A local variable is a variable declared inside a function. A global variable is a variable declared outside of any class or function. Note that local variables and global variables can both be allocated in static storage.
Scope of static variables?
Scope of static variable is with in the file if it is static global. Scope of static variable is with in the function if variable is declared local to a function. But the life time is throughout the program
What is the static variable in the class in c?
A static member variable is local to the class rather than to an object of the class.
What is static variable in the class for c plus plus?
Static member variables are local to the class. That is, there is only one instance of a static member variable, regardless of how many objects are instantiated from the class. As such, they must be declared inside the class, and defined outside of the class.
A variable that is declared inside a method is called variable?
It is called a local variable since it only exists inside the method.
What is difference between Static and Global variable?
Static may be local of global -local static variable is limited to the function scope. and retain it's value when function is been called . compiler differentiate static variables with a prefix function name while dealing with same name static variable in different functions. - Global static variable is visible to all the function defined in the file and retain it value but it cannot be used outside this file. now Global Variable --- this variable is also visible to all of the functions inside the file but also can be used outside the file via extern keyword.
What is a field in java?
A field is an attribute. A field may be a class's variable, an object's variable, an object's method's variable, or a parameter of a function. class bike{ static int bikes;int gear;int cadence; void create( int newGear, int newCadence ){bikes = bikes + 1;gear = newGear; cadence = newCadence;} int getSpeed(){int speed = gear*cadence*5*3.141;return speed;}} 'bikes' is a class's variable (class variable) (static field). 'gear' and 'cadence' could be an object's variables (instance variables) (non-static fields). 'speed' is an object's method's variable (local variable). 'newGear' and 'newCadence' are parameters of a function (parameters). Refer to related links section
what type of variable is visible to every module and the entire program?
If you are talking about a class in Java, a variable encapsulated by a class is called an instance variable b/c everytime you create an object with that class, each object has its own set of the variables declared.
What happens in programming any time a local variable in a method has the same identifier as a class field?
the program will work fine the value will be considered as the value of local variable in the particular method.
What is the scope of any variable?
The Scope of a variable defines the areas of a program where this variable would be visible and can be used. For ex: a. Method variables - are visible only inside the method where they are declared and hence their scope is only the method b. Class variables - are visible inside the class and can be used by any method inside the class and hence their scope is the whole class.
What is the advantage of static character variable?
Static variables exist for the entire duration of the program. Therefore a static character variable is a character that exists for the entire duration the program is running. Regardless of where a static variable is declared and initialised, it is physically instantiated and initialised when the program loads. If the variable has function scope, whatever value is currently assigned to the variable will remain in effect the next time that function is called, but only the function can modify the variable. If the variable has class scope, then the variable exists even if no instances of the class have yet been instantiated, but any and all instances share the variable (it is common to the class, not to any one instance of the class). Static class variables must be initialised outwith the class body and outwith any other function body, but can only be modified by the class members (both static and non-static) and by friends of the class. If the variable has file scope, then the variable is a global variable. Global variables are largely frowned upon as there's no way to control what code can modify the value. Passing local function variables to other functions is the preferred method as this gives much greater control over which code can access and/or modify the value, as well as limiting the lifetime of the variable. To ensure the variable exists throughout a program's lifetime (as per a static variable), instantiate the variable from within the program's entry point.
Static variable in c plus plus?
There are two uses for a static variable in C++. When declared outside of a class, a variable is regarded as being global. However a static variable is deemed local to the file in which it is declared. That is, the variable is scoped to the file, and cannot be accessed by code outside of that file. This aspect was inherited from C. C++ also allows static variables to be declared inside a class. In this case, the variable is local to the class. By contrast, instance variables (non-static member variables) are local to each instance of the class. With static variables, there is only one instance of each variable which can be shared by all instances of the class. It is not unlike a global but it is scoped to the class. Since all static variables are instantiated at compile time, they exist for the entire duration a program runs. Even if they fall from scope, they never lose their value. Static variables defined within a class are also available even when no instances of the class are instantiated. Their visibility outside of the class is dependent upon whether they are declared public, protected or private.
