Technology

Difference between Keyword and Identifier




  • Main Difference

    Keyword, for computer languages, gets defined as a predefined word that gets reserved for working progs that have special meaning and cannot get used anywhere else. Identifier, for computer languages, gets defined as the values used to define different programming items such as variables, integers, structures, unions and others and mostly have an alphabetic character.

    Comparison Chart

    Basis of Distinction Keyword Identifier
    Definition A predefined word that gets reserved for working progs that have special meaning and cannot get used anywhere else. the values used to define different programming items such as variables, integers, structures, unions and others and mostly have an alphabetic character.
    Nature Already get added within a programming language, and the user cannot define them as variables as they produce an error. They have a wider role where they get used as variables, interfaces and even classes and packages.
    Purpose They help to identify a specific property that exists within a computer language. They help to locate the name of the entity that gets defined along with a keyword.

    Keyword

    Keyword, for computer languages, gets defined as a predefined word that gets reserved for working progs that have special meaning and cannot get used anywhere else. Catchphrases are preset, saved words utilized as a part of programming that has an extraordinary significance. Keywords are a piece of the sentence structure, and they can’t get used as an identifier. Keywords are standard identifiers that have standard predefined significance in C. They are all lowercase since capitalized and lowercase characters are not equal it’s conceivable to use a capitalized watchword as an identifier however it’s not a conventional programming term. Such terms get utilized just for their expected reason. They can’t be employed as software engineer characterized identifier. The keywords can’t become used as names for factors. A firmly related and regularly conflated thought is a catchphrase which is a word with extraordinary significance in a particular setting. By differentiation, names in a standard library however not incorporated with the dialect are not viewed as held words or watchwords. The expressions “saved the word” and “watchword” become frequently utilized conversely – one may state that attached name is “saved for use as a catchphrase” – and formal utilize fluctuates from dialect to dialect; for this article, we take the terms as they show. All in all, both these types of words do not require any match, but rather in most present-day dialects catchphrases are a subset of saved words, as this makes parsing less demanding, since slogans can’t be mistaken for identifiers.

    Identifier

    Identifier, for computer languages, gets defined as the values used to define different programming items such as variables, integers, structures, unions and others and mostly have an alphabetic character. Identifiers are names for elements in a C program, for example, factors, exhibits, capacities, structures, unions, and marks. An identifier can be made just out of capitalized, lowercase letters, underscore and digits, however ought to begin just with a message in order or an underscore. If the identifier not utilized as a part of an outer connection prepare, then it is called as the interior. Illustration: Local variable. On the off chance that the identifier gets utilized as a part of an outer connection handle, then it is called as outside. An identifier is a string of alphanumeric characters that starts with an alphabetic character or an underscore character that are utilized to speak to different programming components, for example, factors, capacities, exhibits, structures, unions et cetera. An identifier is a client characterized word. There are 53 characters, to speak to identifiers. They are 52 alphabetic characters and the underscore character. The underscore character considered as a letter in identifiers. The underscore character typically utilized as a part of the center of an identifier. The principal character in an identifier must be a letter set or an underscore and can come after just by any number letters in order, or digits or underscores. They should not start with a number. Likewise, capitalized and lowercase letters are unmistakable. That is, identifiers are case delicate and do not have their own distinction within the program unless specified.

    Key Differences

    • Keyword, for computer languages, gets defined as a predefined word that gets reserved for working progs that have special meaning and cannot get used anywhere else. Identifier, for computer languages, gets defined as the values used to set different programming items such as variables, integers, structures, unions and others and mostly have an alphabetic character.
    • Keywords already get added within a programming language, and the user cannot define them as variables as they produce an error. On the other hand, identifiers have a wider role where they get used as variables, interfaces and even classes and packages.
    • The number of keywords within the programming language of C rates to 52, on the other hand, the number of identifiers can become limitless as anyone can use any word according to the requirement and includes even inger and other values.
    • Keywords help to identify a particular property that exists within a computer language. On the other hand, identifiers contribute to locating the name of the entity that gets defined along with a keyword.
    • For a keyword, the letters always have a lowercase nature and the uppercase one become useless. On the other hand, identifiers may include lower case, upper case and even numbers for their usage.

     

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