Respuesta :
A program explicitly use the reference when accessing an instance variable that is shadowed by a local variable.
Explanation:
A local variable is a variable that is defined locally within the function. It cannot be accessed outside the function. The variables that are declared in the function can be used only within that function.
The local variables can be created with the same name in different functions. A program can explicitly use the reference when the field is shadowed by the local variable.
An instance variable is similar to class variable and it is defined in a class.
When accessing a local variable in a method program explicitly use the reference.
Explanation:
- When we declare a variable as a reference,it is used an alternative name for that variable
- By putting '& ' in the declaration we can tell that the variable is used as a reference.
- If a function receives a reference to a variable, it can modify the value of the variable.
- There are certain limitation of a reference-Once it is used,it cannot be later used to reference another object; it cannot be restated.
- The value of a references cannot be NULL. Initialization of a reference is required when it is declared .
we can use both references and pointers to change the local variables of one function inside another function. Reference and pointer can also be used to save copying of big objects when passed as arguments to functions or returned from functions, to get efficiency gain.
