省赛前的练习A

TEX is a typesetting language developed by Donald Knuth. It takes source text together with a fewtypesetting instructions and produces, one hopes, a beautiful document. Beautiful documents use “and ” to delimit quotations, rather than the mundane " which is what is provided by most keyboards.Keyboards typically do not have an oriented double-quote, but they do have a left-single-quote ` anda right-single-quote '. Check your keyboard now to locate the left-single-quote key ` (sometimescalled the “backquote key”) and the right-single-quote key ' (sometimes called the “apostrophe” orjust “quote”). Be careful not to confuse the left-single-quote ` with the “backslash” key \. TEX letsthe 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 quotationswith the un-oriented double-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 desired form:“To be or not to be,” quoth the bard, “that is the question.”In order to produce the desired form, the source file must contain 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which converts text containing double-quote (") characters into textthat is identical except that double-quotes have been replaced by the two-character sequences requiredby TEX for delimiting quotations with oriented double-quotes. The double-quote (") characters shouldbe replaced appropriately by either `` if the " opens a quotation and by '' if the " closes a quotation.Notice that the question of nested quotations 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.InputInput will consist of several lines of text containing an even number of double-quote (") characters.Input is ended with an end-of-file character.OutputThe 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!''

虽然是简单地替换，花了好长时间。

#include<stdio.h>
#include<string.h>
int main()
{
printf("1\n");
char str[1000];
int i,j=0,len,len1,t=1;
while(gets(str))
{
j=0;
char str1[1000];
memset(str1,0,sizeof(str1));
len=strlen(str);
for(i=0;i<len;i++)
{

if(str[i]=='"'&&t>0)
{
str1[j]='`';
str1[j+1]='`';
j=j+2;
t=-t;

}
else if(str[i]=='"'&&t<0) 
{
str1[j]='\'';
str1[j+1]='\'';
j=j+2;
t=-t;
}
if(str[i]!='"')
{
str1[j]=str[i];
j++;
}
}
puts(str1);
}
return 0;
}