What are the properties of Identifiers?

1. In a program, we must use all the unique identifiers only.2. Identifiers are case sensitive i.e. ‘val’ is different from ‘Val’.3. Identifiers must be different from keywords.

Identifier - Naukri Code 360

Introduction

Identifiers in the programming languages are used to name the objects, variables, and functions. Identifiers are the user-defined words useful to access the values associated with the identifiers. Different languages have their own ways of defining identifiers. Generally, identifiers must be different from the Keywords of a language.

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Few Properties of Identifiers

In a program, we must use all the unique identifiers only.
Identifiers are case sensitive i.e. ‘val’ is different from ‘Val’.
Identifiers must be different from keywords.

Some of the rules for naming identifiers in Java are

All the identifiers must start with the alphabets or an underscore.
Identifiers should be continuous i.e. there should be no space between the name.
‘numberOf People’ is not valid but ‘numberOfPeople’ is valid.
We can not name the identifier with a number at the starting.

Example of valid identifiers:-

numberOfPeople
_first
First1

Example of InValid identifiers:-

numberOf People //space in between
123first //number at the first position
continue //Keyword

Consider the following code:-

import java.io.*;
import java.util.*;

public class Main {
public static void main (String[] args){
Scanner sc = new Scanner(System.in);
  int numberOfPeople = sc.nextInt();
  int NumberOfPeople = sc.nextInt();

  int totalPeople = numberOfPeople + NumberOfPeople;

System.out.println(totalPeople);
}
}

In the above code, numberOfPeople , NumberOfPeople, and totalPeople are the identifiers where the first two identifiers are different because n and N are different and identifiers are case-sensitive.

Also, see Literals in C.Fibonacci Series in C++

Frequently Asked Questions

What are Identifiers?
Identifiers in the programming languages are used to name the objects, variables, and functions. Identifiers are the user-defined words that are useful to access the values associated with the identifiers.
What are the properties of Identifiers?
1. In a program, we must use all the unique identifiers only.
2. Identifiers are case sensitive i.e. ‘val’ is different from ‘Val’.
3. Identifiers must be different from keywords.

Key Takeaways

In this blog, we have covered the following things:

We first discussed what are identifiers.
Then we discussed the properties of identifiers.

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Until then, All the best for your future endeavors, and Keep Coding.