c#定义int变量_在C，C ++和C＃中定义Int

阳光穿透心脏的1/2处 2022-12-06 15:45 186阅读 0赞

c\#定义int变量

Int, short for "integer," is a fundamental [variable][] type built into the [compiler][] and used to define numeric variables holding whole numbers. Other data types include [float][] and [double][].

Int是“整数”的缩写，是[编译器中][compiler]内置的基本[变量][variable]类型，用于定义保存整数的数字变量。 其他数据类型包括[float][]和[double][] 。

C, C++, C\# and many other [programming languages][] recognize int as a data type.

C，C ++，C＃和许多其他[编程语言][programming languages]将int识别为数据类型。

In C++, the following is how you declare an integer variable:

在C ++中，以下是声明整数变量的方式：

int a = 7;

## 整数限制 **(** Int Limitations **)** ##

Only whole numbers can be stored in int variables, but because they can store both positive and negative numbers, they're also considered [signed][].

只能将整数存储在int变量中，但是由于它们既可以存储正数也可以存储负数，因此也将它们视为带[符号的][signed] 。

For example, 27, 4908 and -6575 are valid int entries, but 5.6 and b are not. Numbers with fractional parts require a float or double type variable, both of which can contain decimal points.

例如，27、4908和-6575是有效的int条目，但5.6和b无效。 带小数部分的数字需要浮点型或双精度型变量，这两个变量都可以包含小数点。

The size of number that can be stored in int usually is not defined in the language, but instead depends on the computer running the program. In C\#, int is 32 bits, so the range of values is from -2,147,483,648 to 2,147,483,647. If larger values are required, the double type can be used.

通常可以用int语言存储的数字大小不是以语言定义的，而是取决于运行该程序的计算机。 在C＃中，int是32位，因此值的范围是-2,147,483,648至2,147,483,647。 如果需要更大的值，则可以使用double类型。

## 什么是Nullable Int？ **(** What Is Nullable Int? **)** ##

Nullable int has the same range of values as int, but it can store null in addition to whole numbers. You can assign a value to nullable int just as you would for int, and you can also assign a null value.

Nullable int与int具有相同的值范围，但除整数外，它还可以存储null。 您可以像为int一样为可空int分配值，也可以分配null值。

Nullable int can be useful when you want to add another state (invalid or uninitialized) to a value type. Nullable int cannot be used in [loops][] since loop variables must always be declared as int.

当您想将另一个状态(无效或未初始化)添加到值类型时，可空int很有用。 在[循环中][loops]不能使用可空int，因为必须始终将循环变量声明为int。

## Int vs.Float和Double **(** Int vs. Float and Double **)** ##

Int is similar to the float and double types, but they serve different purposes.

Int与float和double类型相似，但是它们有不同的用途。

**Int:**

**整数：**

*  Takes up less space than other types 
    
    比其他类型占用更少的空间
 *  Has faster arithmetic
    
    运算速度更快
 *  Uses only whole numbers
    
    仅使用整数
 *  Uses caches and data transfer bandwidth more efficiently
    
    更有效地使用缓存和数据传输带宽

**Float and double types**:

**浮点和双精度类型** ：

*  Uses twice as much memory
    
    使用两倍的内存
 *  Can contain a decimal point
    
    可以包含小数点
 *  Can contain more characters
    
    可以包含更多字符

The difference between float and double types lies in the range of values. The range of double is twice that of float, and it accommodates more digits.

float和double类型之间的区别在于值的范围。 double的范围是float的两倍，并且可以容纳更多数字。

**Note:** INT is also used as a formula in Microsoft Excel to round numbers down, but it has nothing to do with int as described on this page.

**注意：** INT在Microsoft Excel中也用作向下舍入数字的公式，但与本页上所述的int无关。

> 翻译自: [https://www.thoughtco.com/definition-of-int-958297][https_www.thoughtco.com_definition-of-int-958297]

c\#定义int变量

[variable]: https://www.thoughtco.com/definition-of-variable-958320
[compiler]: https://www.thoughtco.com/what-is-a-compiler-958322
[float]: https://www.thoughtco.com/definition-of-float-958293
[double]: https://www.thoughtco.com/definition-of-double-958065
[programming languages]: https://www.thoughtco.com/what-is-a-programming-language-958332
[signed]: https://www.thoughtco.com/definition-of-unsigned-958174
[loops]: https://www.thoughtco.com/definition-of-loop-958105
[https_www.thoughtco.com_definition-of-int-958297]: https://www.thoughtco.com/definition-of-int-958297