Tex Quotes, UVa 272

Problem Description

TeX中，左双引号是”““，右双引号是””“。输入一篇包含双引号的文章，你的任务就是把它转换成TeX的格式。

Sample Input

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

Sample Output

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

代码

#include<stdio.h>
#include<string.h>
int main()
{
    int flag = 1;//如果是1就左双引号，0是右双引号
    int c;
    while((c = getchar()) != EOF)
    {
        if(c == '"')
        {
            if(flag)//做双引号
            {
                printf("``");
                flag = !flag;//更新为0，下次见到就是右双引号了
            }
            else
            {
                printf("''");
                flag = !flag;
            }
        }
        else printf("%c", c);
    }
    return 0;
}