Identifiers are names assigned to entities such as values, objects, functions etc , which can be used to identify them
They are created to give a unique name to an entity to identify it during the execution of the program
Variables are also identifiers
Identifiers must be unique for a given scope
x = 10
def inc(y):
x = y + 1
return x In the above Python example, there are two identifiers with the name x(which are variables), one of which is inside the function inc()
Although the variable x can be accessed inside the function with global keyword
The scope of identifier x inside inc() function, begins when it is declared and ends when the execution of the function completes
The scope of the outer variable is till the program runs
Above example can be written in java as
int x = 20;
static void inc(int y) {
x = y + 1;
return x;
}Similar to following rules are followed in some programming languages
keyword