点操作符通过它的左操作数取得右操作数。

The dot operator fetches its right-hand operand from its left.

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如果要强制取得浮点结果，则必须确保操作数中至少有一个为浮点类型。

If you want to force a floating-point result, be sure that at least one of the operands is a floating-point type.

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如果要强制取得浮点结果，则必须确保操作数中至少有一个为浮点类型。

If you want to force a floating-point result, be sure that at least one of the operands is a floating-point type.

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