[注释](%E6%B3%A8%E9%87%8A.md) [变量](%E5%8F%98%E9%87%8F.md) [输入](%E8%BE%93%E5%85%A5.md) [运算符](%E8%BF%90%E7%AE%97%E7%AC%A6.md)