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C/C++是两种广泛使用的编程语言，特别是在系统级编程、游戏开发和高性能计算等领域。C++是C语言的扩展，引入了面向对象编程的概念。在编程过程中，理解并有效地使用库函数是至关重要的，因为它们提供了标准功能，可以帮助开发者节省时间，减少错误，并提高代码的可读性和可维护性。 API，全称为Application Programming Interface，是软件之间交互的一组规则、协议和工具。在C/C++中，API主要由头文件组成，这些头文件定义了库函数的原型，允许程序员在自己的程序中调用这些函数。本资源“c/c++中文帮助文档（API）”为开发者提供了一个全面的参考，帮助他们理解和使用C和C++的各种库函数。 C库函数主要包括I/O操作、内存管理、字符串处理、数学运算、时间日期处理等。例如，`stdio.h`提供了基本的输入/输出操作，如`printf`用于格式化输出，`scanf`用于从标准输入读取数据；`stdlib.h`包含了内存分配和释放的函数，如`malloc`和`free`；`string.h`提供了字符串操作，如`strcpy`用于复制字符串，`strlen`用于计算字符串长度。 C++库函数不仅包括了C库的所有内容，还添加了更多面向对象的特性。例如，`iostream`库提供了流式输入输出，`std::cin`用于从标准输入读取，`std::cout`用于标准输出；`vector`和`list`是两种常用的容器，它们存储和操作动态大小的元素集合；`algorithm`库包含了各种算法，如排序、查找等；`exception`库支持异常处理，使得程序在遇到错误时能够优雅地恢复。这个中文帮助文档将涵盖这些库函数的详细说明，包括参数、返回值、注意事项和示例代码。这对于初学者来说尤其有价值，因为它能帮助他们理解如何正确使用这些函数，避免常见的陷阱。对于经验丰富的开发者，这样的文档也能作为快速查阅的参考，以确保他们在项目中使用了最佳实践。在学习和使用C/C++ API的过程中，理解每个函数的作用和使用场景至关重要。例如，`strcpy`虽然用于复制字符串，但不检查目标缓冲区的大小，可能导致缓冲区溢出，因此更安全的替代品是`strncpy`或`std::string`类。了解这些差异和最佳实践，可以提高代码的安全性和效率。 "c/c++中文帮助文档（API）"是一个宝贵的资源，无论你是刚开始接触C/C++，还是已经在编程领域有一定经验，都可以从中受益。通过深入学习和理解这些API，你将能够更好地利用C/C++的强大功能，编写出高效、可靠且易于维护的代码。

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c++API.rar （69个子文件）

c++API

stdmem_details.html 16KB

cppio_details.html 18KB

cppstring.html 6KB

cppvector_details.html 14KB

ascii.html 11KB

iterators.html 4KB

cppset.html 11KB

cpp_stl.html 3KB

stdmem.html 8KB

cpplist_details.html 12KB

data_types.html 4KB

stdio.html 6KB

stddate_details.html 40KB

operator_precedence.html 3KB

stdio_details.html 27KB

trouble.html 2KB

complete_top.html 3KB

cppdequeue.html 5KB

cppstring_details.html 24KB

preproc.html 3KB

cppmultimap.html 4KB

cppbitset.html 3KB

cppmap_details.html 8KB

containers.html 2KB

cppmap.html 4KB

cppstack.html 3KB

cppmultimap_details.html 7KB

static_return.html 2KB

cppio_flags.html 8KB

complexity.html 3KB

cppqueue.html 2KB

all_c.html 9KB

list.html 2KB

questions.html 6KB

stdother.html 14KB

cppqueue_details.html 3KB

output.html 3KB

keywords_details.html 25KB

placeholder.html 3KB

preproc_details.html 7KB

cppmultiset_details.html 32KB

cppmultiset.html 11KB

cppbitset_details.html 6KB

stdmath.html 21KB

all_cpp.html 17KB

stdother_details.html 88KB

stdmath_details.html 65KB

stddate.html 11KB

cppvector.html 5KB

stdstring.html 38KB

cppio.html 5KB

cppdequeue_details.html 9KB

cpplist.html 5KB

index.html 4KB

all.html 26KB

cpppriorityqueue.html 2KB

cppdeque.html 4KB

top.html 3KB

escape_sequences.html 3KB

links.html 2KB

cppdeque_details.html 9KB

cpppriorityqueue_details.html 3KB

credits.html 2KB

stdstring_details.html 110KB

the_rest.html 2KB

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cppstack_details.html 4KB

cppset_details.html 31KB

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<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <meta name="GENERATOR" content="Microsoft FrontPage 6.0"> <meta name="ProgId" content="FrontPage.Editor.Document"> <title>Standard C String & Character</title> </head> <body> <div class="Section1" style="LAYOUT-GRID: 15.6pt none"> <table style="BACKGROUND: #eeeeff; WIDTH: 100%; mso-cellspacing: 1.5pt; mso-padding-alt: 0cm 0cm 0cm 0cm" cellPadding="0" width="100%" bgColor="#eeeeff" border="0"> <tbody> <tr> <td style="PADDING-RIGHT: 0.75pt; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; PADDING-TOP: 0.75pt"> <p class="MsoNormal"><span lang="EN-US"><a href="file:///C:/Documents%20and%20Settings/ZS/桌面/index.html">cppreference.com</a> -> <a href="file:///C:/Documents%20and%20Settings/ZS/桌面/stdstring.html">Standard C String & Character</a> -> </span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">详解</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体"><o:p> </o:p> </span></p> </td> </tr> </tbody> </table> <h1>标准<span lang="EN-US">c字符和字符串</span></h1> <div class="MsoNormal" style="TEXT-ALIGN: center" align="center"> <span lang="EN-US"> <hr align="center" width="100%" SIZE="2"> </span> </div> <h2><span lang="EN-US"><a name="atof">atof</a></span></h2> <p class="MsoNormal"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">语法</span><span lang="EN-US">:</span></i></p> <table style="BACKGROUND: #ccccff; mso-cellspacing: 1.5pt; mso-padding-alt: 0cm 0cm 0cm 0cm" cellPadding="0" bgColor="#ccccff" border="0"> <tbody> <tr> <td style="PADDING-RIGHT: 0.75pt; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; PADDING-TOP: 0.75pt"> <pre><span lang="EN-US"> <o:p> </o:p> </span></pre> <pre><span lang="EN-US"><span style="mso-spacerun: yes">  </span>#include <stdlib.h></span></pre> <pre><span lang="EN-US"><span style="mso-spacerun: yes">  </span>double atof( const char *str );</span></pre> </td> </tr> </tbody> </table> <p>功能<span lang="EN-US">:将字符串<i>str</i>转换成一个双精度数值并返回结果。参数<i>str</i> 必须以有效数字开头,但是允许以“E”或“e”除外的任意非数字字符结尾。例如：</span></p> <pre><span lang="EN-US"><span style="mso-spacerun: yes">    </span>x = atof( "42.0is_the_answer" );</span></pre> <p style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span lang="EN-US">x的值为42.0.</span></p> <p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相关主题</span><span lang="EN-US">:</span></i><span lang="EN-US"><br> <strong><a href="#atoi">atoi()</a> and <a href="#atol">atol()</a>.</strong></span></p> <div class="MsoNormal" style="TEXT-ALIGN: center; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" align="center"> <span lang="EN-US"> <hr align="center" width="100%" SIZE="2"> </span> </div> <h2 style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span lang="EN-US"> <a name="atoi">atoi</a></span></h2> <p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">语法</span><span lang="EN-US">:</span></i></p> <table style="BACKGROUND: #ccccff; mso-cellspacing: 1.5pt; mso-padding-alt: 0cm 0cm 0cm 0cm" cellPadding="0" bgColor="#ccccff" border="0"> <tbody> <tr> <td style="PADDING-RIGHT: 0.75pt; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; PADDING-TOP: 0.75pt"> <pre><span lang="EN-US"> <o:p> </o:p> </span></pre> <pre><span lang="EN-US"><span style="mso-spacerun: yes">  </span>#include <stdlib.h></span></pre> <pre><span lang="EN-US"><span style="mso-spacerun: yes">  </span>int atoi( const char *str );</span></pre> </td> </tr> </tbody> </table> <p style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt">功能：将字符串<i><span lang="EN-US">str</span></i>转换成一个整数并返回结果。参数<i><span lang="EN-US">str</span></i><span lang="EN-US"> 以数字开头，当函数从<i>str</i> 中读到非数字字符则结束转换并将结果返回。例如，</span></p> <pre><span lang="EN-US"><span style="mso-spacerun: yes">    </span>i = atoi( "512.035" );</span></pre> <p style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span lang="EN-US">i 的值为 512.</span></p> <p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相关主题</span><span lang="EN-US">:</span></i><span lang="EN-US"><br> <strong><a href="#atof">atof()</a> and <a href="#atol">atol()</a>.</strong></span></p> <div class="MsoNormal" style="TEXT-ALIGN: center; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" align="center"> <span lang="EN-US"> <hr align="center" width="100%" SIZE="2"> </span> </div> <h2 style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span lang="EN-US"> <a name="atol">atol</a></span></h2> <p class="MsoNormal" style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><i><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">语法</span><span lang="EN-US">:</span></i></p> <table style="BACKGROUND: #ccccff; mso-cellspacing: 1.5pt; mso-padding-alt: 0cm 0cm 0cm 0cm" cellPadding="0" bgColor="#ccccff" border="0"> <tbody> <tr> <td style="PADDING-RIGHT: 0.75pt; PADDING-LEFT: 0.75pt; PADDING-BOTTOM: 0.75pt; PADDING-TOP: 0.75pt"> <pre><span lang="EN-US"> <o:p> </o:p> </span></pre> <pre><span lang="EN-US"> <span style="mso-spacerun: yes"> </span>#include <stdlib.h></span></pre> <pre><span lang="EN-US"><span style="mso-spacerun: yes">  </span>long atol( const char *str );</span></pre> </td> </tr> </tbody> </table> <p style="tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt">功能：将字符串转换成长整型数并返回结果。函数会扫描参数<i><span lang="EN-US">str</span></i>字符串，跳过前面的空格字符，直到遇上数字或正负符号才开始做转换，而再遇到非数字或字符串结束时才结束转换，并将结果返回。例如，</p> <pre><span lang="EN-US"><span style="mso-spacerun: yes">    </span>x = atol( "1024.0001" );</span></pre> <p style="tab-stops: 45.8pt 91.6pt 1

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