为什么在这个例子中 (int) 周围有括号? [英] Why are there parentheses around (int) in this example?

问题描述

decimal d = 2;
int i = (int) d;

我已经多次看到这种情况，其中括号围绕数据类型.

I've seen this several times in which parentheses are wrapped around data types.

为什么不直接使用 int i = int d;?

推荐答案

(int) 的用法叫做 casting(或者，类型转换).它本质上是在说明，解释 转换 d as 的值> 到 int(整数)并将其存储到 i 中.

The usage of (int) is called casting (or, type-casting). It is essentially telling that, interpret convert the value of d as to an int (integer) and store it into i.

换句话说，它是一种将类型转换为另一种类型的方式(取决于转换的有效性).

In other words, it is a way of converting a type to another one (subject to validity of the conversion).

顺便说一句，int i = int d;，按原样，不是有效的语句.

BTW, int i = int d;, as is, is not a valid statement.

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