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4.1 运算符的优先级 C++/C 语言的运算符有数十个，运算符的优先级与结合律如表 4-1 所示。注意一元 运算符 + - * 的优先级高于对应的二元运算符。 优先级 运算符 结合律 ( ) [ ] -> . 从左至右 ! ~ ++ -- （类型） sizeof + - * & 从右至左 * / % 从左至右 + - 从左至右 << >> 从左至右 < <= > >= 从左至右 == != 从左至右 & 从左至右 ^ 从左至右 | 从左至右 && 从左至右 || 从右至左 ?: 从右至左 从 高 到 低 排 列 = += -= *= /= %= &= ^= |= <<= >>= 从左至右 表 4-1 运算符的优先级与结合律 【规则 4-1-1】如果代码行中的运算符比较多，用括号确定表达式的操作顺序，避免 使用默认的优先级。 由于将表 4-1 熟记是比较困难的，为了防止产生歧义并提高可读性，应当用括号确 定表达式的操作顺序。例如： word = (high << 8) | low