W3School TIY Editor

#include <stdio.h> int main() { int isLoggedIn = 1; int isAdmin = 0; printf("普通用户：%d\n", isLoggedIn && !isAdmin); printf("有访问权限：%d\n", isLoggedIn || isAdmin); printf("未登录：%d\n", !isLoggedIn); return 0; }