「HD_ACM」The Seven Percent Solution

Problem Description

Uniform Resource Identifiers (or URIs) are strings like http://icpc.baylor.edu/icpc/, mailto:[e-mail], ftp://127.0.0.1/pub/linux, or even just readme.txt that are used to identify a resource, usually on the Internet or a local computer. Certain characters are reserved within URIs, and if a reserved character is part of an identifier then it must be percent-encoded by replacing it with a percent sign followed by two hexadecimal digits representing the ASCII code of the character. A table of seven reserved characters and their encodings is shown below. Your job is to write a program that can percent-encode a string of characters.
->统一资源标识符(uri)字符串像http://icpc.baylor.edu/icpc/,mailto:[e-mail],ftp://127.0.0.1/pub/linux,或者只是readme。三种用于确定一个资源,通常在互联网上或本地计算机。某些字符保留在uri,如果保留字符是一个标识符的一部分,那么它必须被代之以百分之一percent-encoded签署两个十六进制数字代表字符的ASCII代码。表七保留字符及其编码如下所示。你的工作是编写一个程序,可以percent-encode一个字符串的字符。
Character  Encoding
" " (space)  %20
"!" (exclamation point)  %21
"$" (dollar sign)  %24
"%" (percent sign)  %25
"(" (left parenthesis)  %28
")" (right parenthesis)  %29
"*" (asterisk)  %2a

 

Input

The input consists of one or more strings, each 1–79 characters long and on a line by itself, followed by a line containing only "#" that signals the end of the input. The character "#" is used only as an end-of-input marker and will not appear anywhere else in the input. A string may contain spaces, but not at the beginning or end of the string, and there will never be two or more consecutive spaces.

->输入由一个或多个字符串,每个1 - 79个字符长,线路上,紧随其后的是一行只包含“#”结束的信号输入。只使用“#”字符作为end-of-input标记和不会出现任何输入。字符串可以包含空格,但不是在字符串的开头或结尾,也永远不会是两个或两个以上的连续空间。

 

Output

For each input string, replace every occurrence of a reserved character in the table above by its percent-encoding, exactly as shown, and output the resulting string on a line by itself. Note that the percent-encoding for an asterisk is %2a (with a lowercase "a") rather than %2A (with an uppercase "A").

->对于每一个输入字符串,取代保留字符的每一个出现在上面的表中百分比编码,如下所示,输出结果的字符串行本身。注意,星号是% 2的百分比编码(小写字母“a”)而不是% 2(用大写字母“a”)。

 

题目公析

代码分析

#include <stdio.h>#include <stdlib.h>int main(){int i=0;char a;char str[100];while((a=getchar()) != '#'){switch(a){case ' ':    str[i++]='%';    str[i++]='2';    str[i++]='0';    break;case '!':    str[i++]='%';    str[i++]='2';    str[i++]='1';    break;case '$':    str[i++]='%';    str[i++]='2';    str[i++]='4';    break;case '%':    str[i++]='%';    str[i++]='2';    str[i++]='5';    break;case '(':    str[i++]='%';    str[i++]='2';    str[i++]='8';    break;case ')':    str[i++]='%';    str[i++]='2';    str[i++]='9';    break;case '*':    str[i++]='%';    str[i++]='2';    str[i++]='a';    break;case '\n':    str[i]='\0';    i=0;    printf("%s\n" , str);    break;default:    str[i++]=a;}}return 0;}