不，这不是显式的类型转换.您可能想要使用以下内容:

No, that's not an explicit typecast. You would want to use something like this:

result = ((double) num1) / ((double) num2);

实际上，由于/运算符的扩展规则，您只需要这些显式强制转换之一，但是同时拥有这两个名称并没有什么害处.实际上，由于强制转换运算符()的优先级高于除法运算符/，因此可以将其写为:

Actually, because of the widening rules for the / operator, you would only need one of those explicit casts, but there's no harm in having both. In fact, because the cast operator () has higher precedence than the division operator /, you could write it as:

result = (double) num1 / num2;

结合了分子的显式转换和分母的隐式转换.

which combines an explicit cast of the numerator and an implicit cast of the denominator.