具有不同int类型的运算 [英] operations with different int types

问题描述

我有一个使用多种不同int类型的程序.

I have a program which uses multiple different int types.

最常用的是uint64_t和标准int.但是我想知道我是否可以安全地进行它们之间的混合操作.

Most often used are uint64_t and the standard int. However I wonder if I can safely do operations mixed between them.

例如，我有一个uint64_t，我想向其中添加一个int，并将该值存储为另一个uint64_t.

For instance I have an uint64_t and I want to add an int to it and store that value as another uint64_t.

这样做安全吗?在可以对int进行操作之前，必须将int强制转换为uint64_t吗?

Is doing such a thing safe? Do I have to cast the int to uint64_t before I can use operations on it?

我真的无法在线上找到有关它的东西.可能只是允许这样做，而没有人质疑它，或者我的Google查询是错误的.

I can`t really find stuff about it online. It might just be allowed and no one questions it or my Google queries are wrong.

无论如何，基本上我的问题是我可以混合使用不同类型的int进行操作吗?

Anyway so basically my question is can I mix and do operations with different types of ints?

推荐答案

是的.

您的编译器将负责转换.唯一需要担心的是溢出-如果将结果存储在小于输入的容器中.

Your compiler will take care of the conversions. The only thing to worry about is overflow - if you store the result in a container that is smaller than the inputs.

您需要的Google搜索字词是隐式类型转换"-例如，参见

The Google search term you need is "implicit type conversions" - see for example http://pic.dhe.ibm.com/infocenter/ratdevz/v8r5/index.jsp?topic=%2Fcom.ibm.tpf.toolkit.compilers.doc%2Fref%2Flangref_os390%2Fcbclr21011.htm

该链接包括下表:

算术转换按以下顺序进行:

Arithmetic conversion proceeds in the following order:

Operand Type                                  Conversion
---------------------------------------------+--------------------------------------------
One operand has long double type             | The other operand is converted to long double type.
---------------------------------------------+--------------------------------------------
One operand has double type                  | The other operand is converted to double.
---------------------------------------------+--------------------------------------------
One operand has float type                   | The other operand is converted to float.
---------------------------------------------+--------------------------------------------
One operand has unsigned long long int type  | The other operand is converted to unsigned long long int.
---------------------------------------------+--------------------------------------------
One operand has long long int type           | The other operand is converted to long long int.
---------------------------------------------+--------------------------------------------
One operand has unsigned long int type       | The other operand is converted to unsigned long int.
---------------------------------------------+--------------------------------------------
One operand has unsigned int type            |
and the other operand has long int type      |
and the value of the unsigned int can be     |
 represented in a long int                   | The operand with unsigned int type is converted to long int.
---------------------------------------------+--------------------------------------------
One operand has unsigned int type            |
and the other operand has long int type      |
and the value of the unsigned int cannot be  |
represented in a long int                    | Both operands are converted to unsigned long int
---------------------------------------------+--------------------------------------------
One operand has long int type                | The other operand is converted to long int.
---------------------------------------------+--------------------------------------------
One operand has unsigned int type            | The other operand is converted to unsigned int.
---------------------------------------------+--------------------------------------------
Both operands have int type                  | The result is type int.
---------------------------------------------+--------------------------------------------

这篇关于具有不同int类型的运算的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！