272 - TEX Quotes

eX Quotes 272 - TEX Quotes

TeX is a typesetting language developed by Donald Knuth. It takes sourcetext together with a few typesetting instructions and produces, one hopes,a beautiful document. Beautiful documents use `` and "to delimit quotations, rather than the mundane" which is what is providedby most keyboards. Keyboards typically do not have an oriented double-quote,but they do have a left-single-quote` and a right-single-quote'. Checkyour keyboard now to locate the left-single-quote key` (sometimes calledthe ``backquote key") and the right-single-quote key' (sometimescalled the ``apostrophe" or just ``quote"). Be carefulnot to confuse the left-single-quote` with the ``backslash" key\. TeX lets the user type two left-single-quotes`` to create a left-double-quote ``and two right-single-quotes '' to create a right-double-quote ''. Most typists,however, are accustomed to delimiting their quotations with the un-orienteddouble-quote".

If the source contained

"To be or not to be," quoth the bard, "that is the question."

then the typeset document produced by TeX would not contain the desiredform:

``To be or not to be," quoth the bard, ``that is the question."

In order to produce the desired form, the source file mustcontain the sequence:

``To be or not to be,'' quoth the bard, ``that is the question.''

You are to write a program which converts text containing double-quote (")characters into text that is identical except that double-quotes have beenreplaced by the two-character sequences required by TeX for delimiting quotationswith oriented double-quotes. The double-quote (") characters shouldbe replaced appropriately by either`` if the" opens a quotation andby '' if the " closes a quotation. Notice that the question of nestedquotations does not arise: The first" must be replaced by``, thenext by '', the next by ``, the next by '', the next by``, the next by '', and so on.

Input and Output

Input will consist of several lines of text containing an even number ofdouble-quote (") characters. Input is ended with an end-of-file character.The text must be output exactly as it was input except that:

• the first " in each pair is replaced by two ` characters: `` and
• the second " in each pair is replaced by two ' characters: ''.

Sample Input

"To be or not to be," quoth the Bard, "thatis the question".The programming contestant replied: "I must disagree.To `C' or not to `C', that is The Question!"

Sample Output

``To be or not to be,'' quoth the Bard, ``thatis the question''.The programming contestant replied: ``I must disagree.To `C' or not to `C', that is The Question!''

大概题意；要输入带"的一段话，把首先出现的"换成``把后面的换成''，可以运用数组，if输入"则变成``下一个"变成''，要想达到这样的效果则可以运用q=!q,每次都是q为真然后让q为假，下一次则就输出''，依次循环，，，收获最大的是q=！q的实际运用！

代码如下；

#include <stdio.h>#include <stdlib.h>

int main(){    char c[200];    int i,j,q=1;    while ((c[i]=getchar())!=EOF)       {        if (c[i]=='"')

               {

                   if (q)                 printf("``");

                 else                printf("''");                q=!q;               }

else                printf("%c",c[i]);       }    return 0;}