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| author | Craig Jennings <c@cjennings.net> | 2025-08-14 22:58:58 -0500 |
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| committer | Craig Jennings <c@cjennings.net> | 2025-08-14 22:58:58 -0500 |
| commit | 82ba818ff456bcd6d56a06226e3f27e98fbb55c3 (patch) | |
| tree | 158cfc17b2f644a10f063cb546752cfaae12c97f /devdocs/c/language%2Ffunctions.html | |
| parent | 9278ddd4ea1a8b1a4c1edaa8894516e3f48d245b (diff) | |
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diff --git a/devdocs/c/language%2Ffunctions.html b/devdocs/c/language%2Ffunctions.html deleted file mode 100644 index 23bdd021..00000000 --- a/devdocs/c/language%2Ffunctions.html +++ /dev/null @@ -1,53 +0,0 @@ - <h1 id="firstHeading" class="firstHeading">Functions</h1> <p>A function is a C language construct that associates a <a href="statements#Compound_statements" title="c/language/statements">compound statement</a> (the function body) with an <a href="identifier" title="c/language/identifier">identifier</a> (the function name). Every C program begins execution from the <a href="main_function" title="c/language/main function">main function</a>, which either terminates, or invokes other, user-defined or library functions.</p> -<div class="c source-c"><pre data-language="c">// function definition. -// defines a function with the name "sum" and with the body "{ return x+y; }" -int sum(int x, int y) -{ - return x + y; -}</pre></div> <p>A function is introduced by a <a href="function_declaration" title="c/language/function declaration">function declaration</a> or a <a href="function_definition" title="c/language/function definition">function definition</a>.</p> -<p>Functions may accept zero or more <i>parameters</i>, which are initialized from the <i>arguments</i> of a <a href="operator_other#Function_call" title="c/language/operator other">function call operator</a>, and may return a value to its caller by means of the <a href="return" title="c/language/return">return statement</a>.</p> -<div class="c source-c"><pre data-language="c">int n = sum(1, 2); // parameters x and y are initialized with the arguments 1 and 2</pre></div> <p>The body of a function is provided in a <a href="function_definition" title="c/language/function definition">function definition</a>. Each <span class="t-rev-inl t-since-c99"><span>non-<a href="inline" title="c/language/inline">inline</a></span><span><span class="t-mark-rev t-since-c99">(since C99)</span></span></span> function that is used in an expression (unless <a href="expressions#Unevaluated_expressions" title="c/language/expressions">unevaluated</a>) must be <a href="extern#One_definition_rule" title="c/language/extern">defined only once</a> in a program.</p> -<p>There are no nested functions (except where allowed through non-standard compiler extensions): each function definition must appear at file scope, and functions have no access to the local variables from the caller:</p> -<div class="c source-c"><pre data-language="c">int main(void) // the main function definition -{ - int sum(int, int); // function declaration (may appear at any scope) - int x = 1; // local variable in main - sum(1, 2); // function call - -// int sum(int a, int b) // error: no nested functions -// { -// return a + b; -// } -} -int sum(int a, int b) // function definition -{ -// return x + a + b; // error: main's x is not accessible within sum - return a + b; -}</pre></div> <h3 id="References"> References</h3> <ul> -<li> C17 standard (ISO/IEC 9899:2018): </li> -<ul> -<li> 6.7.6.3 Function declarators (including prototypes) (p: 96-98) </li> -<li> 6.9.1 Function definitions (p: 113-115) </li> -</ul> -<li> C11 standard (ISO/IEC 9899:2011): </li> -<ul> -<li> 6.7.6.3 Function declarators (including prototypes) (p: 133-136) </li> -<li> 6.9.1 Function definitions (p: 156-158) </li> -</ul> -<li> C99 standard (ISO/IEC 9899:1999): </li> -<ul> -<li> 6.7.5.3 Function declarators (including prototypes) (p: 118-121) </li> -<li> 6.9.1 Function definitions (p: 141-143) </li> -</ul> -<li> C89/C90 standard (ISO/IEC 9899:1990): </li> -<ul> -<li> 3.5.4.3 Function declarators (including prototypes) </li> -<li> 3.7.1 Function definitions </li> -</ul> -</ul> <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/language/function" title="cpp/language/function">C++ documentation</a></span> for <span class=""><span>Declaring functions</span></span> </td> -</tr> </table> <div class="_attribution"> - <p class="_attribution-p"> - © cppreference.com<br>Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.<br> - <a href="https://en.cppreference.com/w/c/language/functions" class="_attribution-link">https://en.cppreference.com/w/c/language/functions</a> - </p> -</div> |
