The binary operators, when applied to operands of built-in or compound type, usually require that the operands be the same type, or types that can be converted to a common type.

• 对于操作数为内置或复合类型的二元操作符，通常要求它的两个操作数具有相同的数据类型，或者其类型可以转换为同一种数据类型。