{"id":2534,"date":"2025-07-17T14:27:49","date_gmt":"2025-07-17T13:27:49","guid":{"rendered":"https:\/\/workboot.fr\/ciela\/?page_id=2534"},"modified":"2025-07-17T14:31:42","modified_gmt":"2025-07-17T13:31:42","slug":"les-fonctions-en-langage-c","status":"publish","type":"page","link":"https:\/\/workboot.fr\/ciela\/les-fonctions-en-langage-c\/","title":{"rendered":"Les fonctions en langage C"},"content":{"rendered":"\n<nav aria-label=\"Table des mati\u00e8res\" class=\"wp-block-table-of-contents\"><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/les-fonctions-en-langage-c\/#qu-est-ce-qu-une-fonction\">Qu\u2019est-ce qu\u2019une fonction ?<\/a><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/les-fonctions-en-langage-c\/#structure-d-une-fonction\">Structure d\u2019une fonction<\/a><\/li><\/ol><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/les-fonctions-en-langage-c\/#exemple-simple\">Exemple simple :<\/a><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/les-fonctions-en-langage-c\/#types-de-fonctions\">Types de fonctions<\/a><\/li><\/ol><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/les-fonctions-en-langage-c\/#exemple-complet\">Exemple complet<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/les-fonctions-en-langage-c\/#pourquoi-utiliser-des-fonctions\">Pourquoi utiliser des fonctions ?<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/les-fonctions-en-langage-c\/#resume-a-retenir\">R\u00e9sum\u00e9 \u00e0 retenir<\/a><\/li><\/ol><\/nav>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"qu-est-ce-qu-une-fonction\">Qu\u2019est-ce qu\u2019une fonction ?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">En C, une <strong>fonction<\/strong> est un bloc de code <strong>nomm\u00e9<\/strong> qui effectue une t\u00e2che pr\u00e9cise.<br>Elle permet de <strong>r\u00e9utiliser du code<\/strong> et d\u2019<strong>organiser un programme en morceaux logiques<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"structure-d-une-fonction\">Structure d\u2019une fonction<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>type_de_retour nom_de_fonction(param\u00e8tres) \n{\n    \/\/ instructions\n    return valeur;  \/\/ si n\u00e9cessaire\n}<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"exemple-simple\">Exemple simple :<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">un fonction carre , on va donner x  ici une valeur enti\u00e8re et la fonction va nous renvoyer le carr\u00e9 de x , x*x <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int carre(int x) \n{\n    return x * x;\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">appel de la fonction<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int resultat;\nresultat = carre(5);  \/* Appel \u2192 retourne 25 *\/\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"types-de-fonctions\">Types de fonctions<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Type de fonction<\/th><th>Exemple<\/th><\/tr><\/thead><tbody><tr><td>Retourne une valeur<\/td><td><code>int carre(int x)<\/code><\/td><\/tr><tr><td>Ne retourne rien (<code>void<\/code>)<\/td><td><code>void afficher()<\/code><\/td><\/tr><tr><td>Avec ou sans param\u00e8tres<\/td><td><code>int f()<\/code> ou <code>int f(int x)<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"exemple-complet\">Exemple complet<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Dans un programme ou la fonction main , fonction minimal d&rsquo;un code c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;stdio.h>\n#include &lt;stdlib.h>\n\n\/* fonction carr\u00e9 *\/\nint carre(int n) \n{\n    return n * n;\n}\n\n\/* Programme principal *\/\nint main() \n{\nint val;\nint resultat;\n\n    val = 4;\n    resultat = carre (val);\n    printf(\"Le carr\u00e9 de %d est %d\\n\", val, resultat);\n    return EXIT_SUCCESS;\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">R\u00e9sultat:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>etudiant@ordi:~\/Works\/TP3_C\/carre$ .\/carre \nLe carr\u00e9 de 4 est 16<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"pourquoi-utiliser-des-fonctions\">Pourquoi utiliser des fonctions ?<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u2702\ufe0f \u00c9vite la r\u00e9p\u00e9tition de code<\/li>\n\n\n\n<li>\ud83e\udde0 Facilite la lecture et la maintenance<\/li>\n\n\n\n<li>\ud83d\udd04 Permet de d\u00e9couper un programme complexe<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"resume-a-retenir\">R\u00e9sum\u00e9 \u00e0 retenir<\/h1>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u00c9l\u00e9ment<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td><code>void<\/code><\/td><td>Fonction qui ne retourne rien<\/td><\/tr><tr><td><code>return<\/code><\/td><td>Renvoie une valeur<\/td><\/tr><tr><td><code>param\u00e8tre<\/code><\/td><td>Variable d\u2019entr\u00e9e de la fonction<\/td><\/tr><tr><td><code>appel<\/code><\/td><td>Utilisation de la fonction<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Qu\u2019est-ce qu\u2019une fonction ? En C, une fonction est un bloc de code nomm\u00e9 qui effectue une t\u00e2che pr\u00e9cise.Elle permet de r\u00e9utiliser du code et d\u2019organiser un programme en morceaux [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_crdt_document":"","_uag_custom_page_level_css":"","footnotes":""},"class_list":["post-2534","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Les fonctions en langage C - workboot<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/workboot.fr\/ciela\/les-fonctions-en-langage-c\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les fonctions en langage C - workboot\" \/>\n<meta property=\"og:description\" content=\"Qu\u2019est-ce qu\u2019une fonction ? 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