{"id":225573,"date":"2024-01-14T20:39:15","date_gmt":"2024-01-14T20:39:15","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/"},"modified":"2024-01-14T20:39:15","modified_gmt":"2024-01-14T20:39:15","slug":"what-is-the-default-value-of-extern-variable-in-c","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/","title":{"rendered":"What is the default value of extern variable in C?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/#What_is_the_default_value_of_extern_variable_in_C\" title=\"What is the default value of extern variable in C?\">What is the default value of extern variable in C?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/#Frequently_Asked_Questions\" title=\"Frequently Asked Questions:\">Frequently Asked Questions:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/#1_What_is_an_extern_variable_in_C\" title=\"1. What is an extern variable in C?\">1. What is an extern variable in C?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/#2_Do_extern_variables_have_a_storage_location\" title=\"2. Do extern variables have a storage location?\">2. Do extern variables have a storage location?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/#3_Can_extern_variables_be_initialized\" title=\"3. Can extern variables be initialized?\">3. Can extern variables be initialized?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/#4_What_happens_if_an_extern_variable_is_not_explicitly_initialized\" title=\"4. What happens if an extern variable is not explicitly initialized?\">4. What happens if an extern variable is not explicitly initialized?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/#5_How_can_I_initialize_an_extern_variable\" title=\"5. How can I initialize an extern variable?\">5. How can I initialize an extern variable?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/#6_Can_I_define_an_extern_variable_with_the_same_name_in_multiple_files\" title=\"6. Can I define an extern variable with the same name in multiple files?\">6. Can I define an extern variable with the same name in multiple files?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/#7_Can_I_initialize_an_extern_variable_in_multiple_files\" title=\"7. Can I initialize an extern variable in multiple files?\">7. Can I initialize an extern variable in multiple files?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/#8_Can_I_change_the_value_of_an_extern_variable_in_different_files\" title=\"8. Can I change the value of an extern variable in different files?\">8. Can I change the value of an extern variable in different files?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/#9_Are_extern_variables_affected_by_scope_rules\" title=\"9. Are extern variables affected by scope rules?\">9. Are extern variables affected by scope rules?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/#10_Can_I_use_an_extern_variable_without_a_declaration\" title=\"10. Can I use an extern variable without a declaration?\">10. Can I use an extern variable without a declaration?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/#11_What_is_the_purpose_of_using_extern_variables\" title=\"11. What is the purpose of using extern variables?\">11. What is the purpose of using extern variables?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/#12_Can_I_declare_an_extern_variable_without_defining_it_anywhere\" title=\"12. Can I declare an extern variable without defining it anywhere?\">12. Can I declare an extern variable without defining it anywhere?<\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_default_value_of_extern_variable_in_C\"><\/span>What is the default value of extern variable in C?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The default value of an `extern` variable in C is *undefined*. Unlike global variables, which are automatically initialized with a default value of zero, extern variables do not have a defined initial value. It is important to explicitly initialize extern variables before using them to avoid potential issues and ensure the desired behavior.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h3><span class=\"ez-toc-section\" id=\"1_What_is_an_extern_variable_in_C\"><\/span>1. What is an extern variable in C?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nAn extern variable is a global variable that is declared in one file but can be accessed by other files in a program.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Do_extern_variables_have_a_storage_location\"><\/span>2. Do extern variables have a storage location?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, extern variables have a storage location, but their value is determined by the definition in another file.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Can_extern_variables_be_initialized\"><\/span>3. Can extern variables be initialized?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nExtern variables can be initialized, but it is recommended to initialize them explicitly to avoid potential issues.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_What_happens_if_an_extern_variable_is_not_explicitly_initialized\"><\/span>4. What happens if an extern variable is not explicitly initialized?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nIf an extern variable is not explicitly initialized, it will have an undefined value, which can lead to unexpected behavior.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_How_can_I_initialize_an_extern_variable\"><\/span>5. How can I initialize an extern variable?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nExtern variables can be initialized by assigning them a value in the file where they are defined, or they can be initialized using an assignment statement in a function.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_Can_I_define_an_extern_variable_with_the_same_name_in_multiple_files\"><\/span>6. Can I define an extern variable with the same name in multiple files?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, it is possible to define an extern variable with the same name in multiple files, but it can lead to conflicts and should be avoided.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_Can_I_initialize_an_extern_variable_in_multiple_files\"><\/span>7. Can I initialize an extern variable in multiple files?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, an extern variable can only be initialized once in a program. Multiple initializations can lead to linker errors.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"8_Can_I_change_the_value_of_an_extern_variable_in_different_files\"><\/span>8. Can I change the value of an extern variable in different files?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, the value of an extern variable can be changed in different files, as long as they are all referring to the same extern variable.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"9_Are_extern_variables_affected_by_scope_rules\"><\/span>9. Are extern variables affected by scope rules?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nExtern variables have global scope, meaning they can be accessed from any part of a program, but they can still be limited by other scope rules if declared within a particular block.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"10_Can_I_use_an_extern_variable_without_a_declaration\"><\/span>10. Can I use an extern variable without a declaration?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, an extern variable must be declared in a file before it is used. The actual definition can be in another file.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"11_What_is_the_purpose_of_using_extern_variables\"><\/span>11. What is the purpose of using extern variables?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nExtern variables are commonly used to share data between multiple files of a program, allowing them to communicate and exchange information.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"12_Can_I_declare_an_extern_variable_without_defining_it_anywhere\"><\/span>12. Can I declare an extern variable without defining it anywhere?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, it is possible to declare an extern variable without defining it anywhere, but the variable must be defined in another file for the program to link successfully.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What is the default value of extern variable in C? The default value of an `extern` variable in C is *undefined*. Unlike global variables, which are automatically initialized with a default value of zero, extern variables do not have a defined initial value. It is important to explicitly initialize extern variables before using them to &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"What is the default value of extern variable in C?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/what-is-the-default-value-of-extern-variable-in-c\/#more-225573\">Read more<span class=\"screen-reader-text\">What is the default value of extern variable in C?<\/span><\/a><\/p>\n","protected":false},"author":56,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-225573","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is the default value of extern variable in C?<\/title>\n<meta name=\"description\" content=\"What is the default value of extern variable in C? 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The default value of an `extern` variable in C is *undefined*. 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