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认识sscanf函数

2024-07-09 15:00:40   222人阅读

sscanf函数 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <style type="text/css"> /* GitHub stylesheet for MarkdownPad (http://markdownpad.com) / / Author: Nicolas Hery - http://nicolashery.com / / Version: b13fe65ca28d2e568c6ed5d7f06581183df8f2ff / / Source: https://github.com/nicolahery/markdownpad-github */

/* RESET =============================================================================*/

html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video { margin: 0; padding: 0; border: 0; }

/* BODY =============================================================================*/

body { font-family: Helvetica, arial, freesans, clean, sans-serif; font-size: 14px; line-height: 1.6; color: #333; background-color: #fff; padding: 20px; max-width: 960px; margin: 0 auto; }

body>*:first-child { margin-top: 0 !important; }

body>*:last-child { margin-bottom: 0 !important; }

/* BLOCKS =============================================================================*/

p, blockquote, ul, ol, dl, table, pre { margin: 15px 0; }

/* HEADERS =============================================================================*/

h1, h2, h3, h4, h5, h6 { margin: 20px 0 10px; padding: 0; font-weight: bold; -webkit-font-smoothing: antialiased; }

h1 tt, h1 code, h2 tt, h2 code, h3 tt, h3 code, h4 tt, h4 code, h5 tt, h5 code, h6 tt, h6 code { font-size: inherit; }

h1 { font-size: 28px; color: #000; }

h2 { font-size: 24px; border-bottom: 1px solid #ccc; color: #000; }

h3 { font-size: 18px; }

h4 { font-size: 16px; }

h5 { font-size: 14px; }

h6 { color: #777; font-size: 14px; }

body>h2:first-child, body>h1:first-child, body>h1:first-child+h2, body>h3:first-child, body>h4:first-child, body>h5:first-child, body>h6:first-child { margin-top: 0; padding-top: 0; }

a:first-child h1, a:first-child h2, a:first-child h3, a:first-child h4, a:first-child h5, a:first-child h6 { margin-top: 0; padding-top: 0; }

h1+p, h2+p, h3+p, h4+p, h5+p, h6+p { margin-top: 10px; }

/* LINKS =============================================================================*/

a { color: #4183C4; text-decoration: none; }

a:hover { text-decoration: underline; }

/* LISTS =============================================================================*/

ul, ol { padding-left: 30px; }

ul li > :first-child, ol li > :first-child, ul li ul:first-of-type, ol li ol:first-of-type, ul li ol:first-of-type, ol li ul:first-of-type { margin-top: 0px; }

ul ul, ul ol, ol ol, ol ul { margin-bottom: 0; }

dl { padding: 0; }

dl dt { font-size: 14px; font-weight: bold; font-style: italic; padding: 0; margin: 15px 0 5px; }

dl dt:first-child { padding: 0; }

dl dt>:first-child { margin-top: 0px; }

dl dt>:last-child { margin-bottom: 0px; }

dl dd { margin: 0 0 15px; padding: 0 15px; }

dl dd>:first-child { margin-top: 0px; }

dl dd>:last-child { margin-bottom: 0px; }

/* CODE =============================================================================*/

pre, code, tt { font-size: 12px; font-family: Consolas, "Liberation Mono", Courier, monospace; }

code, tt { margin: 0 0px; padding: 0px 0px; white-space: nowrap; border: 1px solid #eaeaea; background-color: #f8f8f8; border-radius: 3px; }

pre>code { margin: 0; padding: 0; white-space: pre; border: none; background: transparent; }

pre { background-color: #f8f8f8; border: 1px solid #ccc; font-size: 13px; line-height: 19px; overflow: auto; padding: 6px 10px; border-radius: 3px; }

pre code, pre tt { background-color: transparent; border: none; }

kbd { -moz-border-bottom-colors: none; -moz-border-left-colors: none; -moz-border-right-colors: none; -moz-border-top-colors: none; background-color: #DDDDDD; background-image: linear-gradient(#F1F1F1, #DDDDDD); background-repeat: repeat-x; border-color: #DDDDDD #CCCCCC #CCCCCC #DDDDDD; border-image: none; border-radius: 2px 2px 2px 2px; border-style: solid; border-width: 1px; font-family: "Helvetica Neue",Helvetica,Arial,sans-serif; line-height: 10px; padding: 1px 4px; }

/* QUOTES =============================================================================*/

blockquote { border-left: 4px solid #DDD; padding: 0 15px; color: #777; }

blockquote>:first-child { margin-top: 0px; }

blockquote>:last-child { margin-bottom: 0px; }

/* HORIZONTAL RULES =============================================================================*/

hr { clear: both; margin: 15px 0; height: 0px; overflow: hidden; border: none; background: transparent; border-bottom: 4px solid #ddd; padding: 0; }

/* TABLES =============================================================================*/

table th { font-weight: bold; }

table th, table td { border: 1px solid #ccc; padding: 6px 13px; }

table tr { border-top: 1px solid #ccc; background-color: #fff; }

table tr:nth-child(2n) { background-color: #f8f8f8; }

/* IMAGES =============================================================================*/

img { max-width: 100% } </style> <body>

sscanf函数基本知识

函数原型

int sscanf( const char *buffer, const char *format [, argument ] ... );

函数功能

将buffer中的数据按照format格式读取后存储在argument中，返回值表示为成功转换的的数据个数，如果在第一次转换之前候遇到文件结尾就返回EOF。

实例一

#include<stdio.h>
int main()
{
    char *buffer = "asdfg10112022";
    char *temp1[10];
    char *temp2[20];
    sscanf(buffer,"%[a-zA-Z]%[1-9]",temp1,temp2);
    printf("%s\n%s\n",temp1,temp2);
    printf("%d\n",sscanf(buffer,%[a-zA-Z]%[1-9]));
    return 0;
}

sscanf一般的用法

1. 常见用法。

charbuf[512];
sscanf("123456","%s",buf);//此处buf是数组名，它的意思是将123456以%s的形式存入buf中
printf("%s\n",buf);//123456

2. 取指定长度的字符串。如在下例中，取最大长度为4字节的字符串。

sscanf("123456","%4s",buf);
printf("%s\n",buf);//1234

3. 取到指定字符为止的字符串。如在下例中，取遇到空格为止字符串。

sscanf("123456abcd  edf","%[^ ]",buf);
printf("%s\n",buf);//123456abcd

4. 取仅包含指定字符集的字符串。如在下例中，取仅包含1到9和小写字母的字符串。

sscanf("123456abcdedfBCDEF","%[1-9a-z]",buf);
printf("%s\n",buf);//123456abcded

5. 取到指定字符集为止的字符串。如在下例中，取遇到大写字母为止的字符串。

sscanf("123456abcdedfBCDEF","%[^A-Z]",buf);
printf("%s\n",buf);//sscanf("123456abcdedfBCDEF","%[^A-Z]",buf);
printf("%s\n",buf);

6、给定一个字符串iios/12DDWDFF@122，获取 / 和 @ 之间的字符串。

sscanf("iios/12DDWDFF@122","%*[^/]/%[^@]",buf);
printf("%s\n",buf);//12DDWDFF

7、给定一个字符串“hello, world”，仅保留world。

sscanf(“hello, world”,"%*s%s",buf);/%s遇空格停止，加*则是忽略第一个读到的字符串。
printf("%s\n",buf);//word


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