Addition of an int and a double results in a double.

int和 doubule 类型的两个数相加，结果是一个double 类型的数。

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Here, the int is converted to a double before addition.

此处int 类型的数在执行加法运算之前转换成double 类型。

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To match the second function, the int argument 42 must be converted to a double.

如果使之与第二个函数匹配，就必须将int 型实参42 转换为double 型的值。

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To match the second function, the int argument 42 must be converted to a double.

如果使之与第二个函数匹配，就必须将int 型实参42 转换为double 型的值。

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