#include <stdio.h>int main(){ int c, q = 1; while ((c = getchar()) != EOF) { if (c == ‘"‘) { printf(q ? "``" : "‘‘"); q ^= 1; } else putchar(c); } return 0;}
UVa272 TEX Quotes
原文：http://www.cnblogs.com/danny1221/p/4590394.html
