程序 3-5 Tex中的引号

#include "pch.h"
#include <iostream>

int main() {
	// c one char; q flag
	char c;
	int q = 1;
	while ((c = getchar()) != EOF) {
		if (c == '"') {
			printf("%s", q ? "``" : "''");
			q = !q;
		}
		else {
			printf("%c", c);
		}
	}
}