HDU-1088Write a simple HTML Browser

[align=left]Problem Description[/align]
If you ever tried to read a html document on a Macintosh, you know how hard it is if no Netscape is installed.

Now, who can forget to install a HTML browser? This is very easy because most of the times you don't need one on a MAC because there is a Acrobate Reader which is native to MAC. But if you ever need one, what do you do?

Your task is to write a small html-browser. It should only display the content of the input-file and knows only the html commands (tags) <br> which is a linebreak and <hr> which is a horizontal ruler. Then you should treat all tabulators, spaces and newlines
as one space and display the resulting text with no more than 80 characters on a line.

[align=left]Input[/align]
The input consists of a text you should display. This text consists of words and HTML tags separated by one or more spaces, tabulators or newlines.

A word is a sequence of letters, numbers and punctuation. For example, "abc,123" is one word, but "abc, 123" are two words, namely "abc," and "123". A word is always shorter than 81 characters and does not contain any '<' or '>'. All HTML tags are either <br>
or <hr>.

[align=left]Output[/align]
You should display the the resulting text using this rules:

. If you read a word in the input and the resulting line does not get longer than 80 chars, print it, else print it on a new line.

. If you read a <br> in the input, start a new line.

. If you read a <hr> in the input, start a new line unless you already are at the beginning of a line, display 80 characters of '-' and start a new line (again).

The last line is ended by a newline character.

[align=left]Sample Input[/align]

Hallo, dies ist eine
ziemlich lange Zeile, die in Html
aber nicht umgebrochen wird.
<br>
Zwei <br> <br> produzieren zwei Newlines.
Es gibt auch noch das tag <hr> was einen Trenner darstellt.
Zwei <hr> <hr> produzieren zwei Horizontal Rulers.
Achtung       mehrere Leerzeichen irritieren

Html genauso wenig wie

mehrere Leerzeilen.

[align=left]Sample Output[/align]

Hallo, dies ist eine ziemlich lange Zeile, die in Html aber nicht umgebrochen
wird.
Zwei

produzieren zwei Newlines. Es gibt auch noch das tag
--------------------------------------------------------------------------------
was einen Trenner darstellt. Zwei
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
produzieren zwei Horizontal Rulers. Achtung mehrere Leerzeichen irritieren Html
genauso wenig wie mehrere Leerzeilen.

代码;

#include<stdio.h>
#include<string.h>
int main()
{
int i,flag,num;
char str[100];
num=0;
flag=0;//状态变量

while(scanf("%s",str)!=-1)
{

if(strcmp(str,"<br>")==0)
{
printf("\n");
num=0;
flag=0;
}
else if(strcmp(str,"<hr>")==0)
{
if(flag!=0)
printf("\n");
for(i=1;i<=80;i++)
printf("-");
printf("\n");
flag=0;
num=0;
}
else if(flag==0)
{
printf("%s",str);
flag=1;
num+=strlen(str);
}
else
{
num+=strlen(str)+1;
if(num>80)
{
printf("\n");
num=strlen(str);
printf("%s",str);
}
else
printf(" %s",str);
}
}
if(flag!=0)
printf("\n");
return 0;
}

思路解析：

题意 ：输入1串字符 每行最多80个，每个单词都是连续的，不连续的不算一个单词 即不给空格 tab 等分开的字符 一个单词中不包含< > 包含其他符号

遇到 <br> 则输出空格

遇到<hr> 则换到下一行 然后输出80个- 然后再换一行 注意 如果是已经在一个新的一行了 就不用再换到下一行后再输出80个‘-’ 就可以直接输出

输出的时候 每行最多有80个字符 每个单词之间有1个空格

用到了比较字符串函数strcmp()...