{"id":50035,"date":"2021-11-17T13:39:32","date_gmt":"2021-11-17T08:09:32","guid":{"rendered":"https:\/\/www.mygreatlearning.com\/blog\/identifiers-in-c\/"},"modified":"2024-02-23T18:31:28","modified_gmt":"2024-02-23T13:01:28","slug":"identifiers-in-c","status":"publish","type":"post","link":"https:\/\/www.mygreatlearning.com\/blog\/identifiers-in-c\/","title":{"rendered":"Identifiers in C"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"what-is-c\">What is C ?<\/h2>\n\n\n\n<p>C as a language is a beginners choice for programming. It\u2019s important to know the basics of any language before you jump into writing programs.&nbsp;<\/p>\n\n\n\n<p>Talking about identifiers, identifiers are names given to entities such as variable, function, array, structure, union , label etc. An identifier starts with letters and can be followed by underscore , digits or symbols. The starting letter of an identifier must be an alphabet or underscore.&nbsp;<\/p>\n\n\n\n<p>If an identifier is used in external linkage then it is termed as external identifier and if an identifier is not used in external linkage then it is termed as internal identifier.&nbsp;<\/p>\n\n\n\n<p>In a precise way, identifier is a collection of alphanumeric characters that starts with either alphabet or underscore. There are 52 alphabetic characters ( including uppercase and lowercase), underscore character, ten digits ( from 0 to 9), representing an identifier.&nbsp;<\/p>\n\n\n\n    <div class=\"courses-cta-container\">\n        <div class=\"courses-cta-card\">\n            <div class=\"courses-cta-header\">\n                <div class=\"courses-learn-icon\"><\/div>\n                <span class=\"courses-learn-text\">Academy PRO<\/span>\n            <\/div>\n            <p class=\"courses-cta-title\">\n                <a href=\"https:\/\/www.mygreatlearning.com\/academy\/premium\/learn-c-programming-from-scratch\" class=\"courses-cta-title-link\">C Programming Course: Master C with Hands-on Projects<\/a>\n            <\/p>\n            <p class=\"courses-cta-description\">Join our C Programming Course and learn C syntax, operators, expressions, control flow, functions, pointers, structures, file handling, memory management, and modular programming. Build real-world skills through practical projects!<\/p>\n            <div class=\"courses-cta-stats\">\n                <div class=\"courses-stat-item\">\n                    <div class=\"courses-stat-icon courses-user-icon\"><\/div>\n                    <span>2 Projects<\/span>\n                <\/div>\n                <div class=\"courses-stat-item\">\n                    <div class=\"courses-stat-icon courses-star-icon\"><\/div>\n                    <span>10 Hrs<\/span>\n                <\/div>\n            <\/div>\n            <a href=\"https:\/\/www.mygreatlearning.com\/academy\/premium\/learn-c-programming-from-scratch\" class=\"courses-cta-button\">\n                C Programming Course with Certificate\n                <div class=\"courses-arrow-icon\"><\/div>\n            <\/a>\n        <\/div>\n    <\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"examples-of-identifier\">Examples of identifier:&nbsp;<\/h3>\n\n\n\n<p>int amount;&nbsp;<\/p>\n\n\n\n<p>double _bal7nb;&nbsp;<\/p>\n\n\n\n<p>Here , \u2018 amount\u2019 and \u2018 _bal7nb\u2019 are identifiers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"rules-for-naming-identifiers-in-c\"><strong>Rules for naming identifiers in C&nbsp;<\/strong><\/h3>\n\n\n\n<p>\u25cf The first letter of an identifier should be either alphabet or underscore.&nbsp;<\/p>\n\n\n\n<p>\u25cf The alphabet can be either in uppercase or lowercase. \u25cf The first identifier can not start with the digit.&nbsp;<\/p>\n\n\n\n<p>\u25cf After the first letter identifier can have character, digit, underscore.&nbsp;<\/p>\n\n\n\n<p>\u25cf Identifiers are case sensitive, uppercase and lowercase letters are distinct.&nbsp;<\/p>\n\n\n\n<p>\u25cf Commas and blank space are invalid while naming an identifier. \u25cf Maximum length of the identifier is 31 characters. \u25cf Keywords can not be named as an identifier.&nbsp;<\/p>\n\n\n\n<p>\u25cf Identifiers should be short, meaningful and easy to understand.&nbsp;<\/p>\n\n\n\n<p>Examples of identifier:&nbsp;<\/p>\n\n\n\n<p>arnaV, Sum_, _lifeHack;&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"types-of-identifier\"><strong>Types of identifier&nbsp;<\/strong><\/h3>\n\n\n\n<p><strong>There are two types of identifier:&nbsp;<\/strong><\/p>\n\n\n\n<p>1. Internal Identifier&nbsp;<\/p>\n\n\n\n<p>2. External Identifier&nbsp;<\/p>\n\n\n\n<p><strong>1. Internal identifier : <\/strong>Identifiers which are used as a local variable or are not used in external linkage are called internal identifiers.<\/p>\n\n\n\n<p><strong>2. External identifier: <\/strong>Identifiers which are used as a global variable or used for naming function or any other external linkage are called external identifiers.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"lets-differentiate-between-keywords-and-identifier\"><strong>Let\u2019s differentiate between Keywords and Identifier&nbsp;<\/strong><\/h3>\n\n\n\n<p>In a programming language, keywords are predefined, reserved words which have a specific meaning to the compiler. In short, keywords are part of syntax while writing a program and cannot be used while naming an identifier.&nbsp;<\/p>\n\n\n\n<p>\u25cf Keywords are written in lowercase while identifiers can be written in either uppercase or lowercase.&nbsp;<\/p>\n\n\n\n<p>\u25cf Meaning of keyword is predefined to the c compiler while in case of identifier the meaning is not pre - defined to the c compiler.&nbsp;<\/p>\n\n\n\n<p>\u25cf Keywords are combinations of alphabetical characters whereas identifiers are collections of alphanumeric characters. \u25cf Keywords can not contain underscore character while identifiers can have underscore character.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"examples-of-keywords\"><strong>Examples of keywords:&nbsp;<\/strong><\/h3>\n\n\n\n<p>auto , double, int, float, char, else, long, switch, case, do, for, static, while, loop, short, default, volatile etc.<\/p>\n\n\n\n<p>Let\u2019s test case sensitivity of identifiers with the help of a program.&nbsp;<\/p>\n\n\n\n<p>int main ()&nbsp;<\/p>\n\n\n\n<p>{&nbsp;<\/p>\n\n\n\n<p>int h = 78;&nbsp;<\/p>\n\n\n\n<p>int H = 43;&nbsp;<\/p>\n\n\n\n<p>printf( \u201c Value stored in h is : %d\u201d, h);&nbsp;<\/p>\n\n\n\n<p>printf( \u201c \\nValue stored in H is : %d\u201d, H);&nbsp;<\/p>\n\n\n\n<p>return 0;&nbsp;<\/p>\n\n\n\n<p>}&nbsp;<\/p>\n\n\n\n<p><strong>Output of the following program will be :&nbsp;<\/strong><\/p>\n\n\n\n<p>Value stored in h is : 78&nbsp;<\/p>\n\n\n\n<p>Value stored in H is : 43&nbsp;<\/p>\n\n\n\n<p>The output shows that the identifier is case sensitive.<\/p>\n\n\n\n<p>A<a href=\"https:\/\/www.mygreatlearning.com\/academy\/learn-for-free\/courses\/c-for-beginners1\" target=\"_blank\" rel=\"noreferrer noopener\"> professional course<\/a> can always help you enhance your knowledge about C. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>What is C ? C as a language is a beginners choice for programming. It\u2019s important to know the basics of any language before you jump into writing programs.&nbsp; Talking about identifiers, identifiers are names given to entities such as variable, function, array, structure, union , label etc. An identifier starts with letters and can [&hellip;]<\/p>\n","protected":false},"author":41,"featured_media":50042,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25860],"tags":[36889],"content_type":[],"class_list":["post-50035","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software","tag-c-programming-2"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Identifiers in C<\/title>\n<meta name=\"description\" content=\"C as a language is a beginners choice for programming. 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