c#如何定义float变量_C，C ++和C＃中的Float定义

末蓝、 2022-12-06 15:47 230阅读 0赞

c\#如何定义float变量

Float is a shortened term for "floating point." By definition, it's a fundamental data type built into the compiler that's used to define numeric values with floating decimal points. C, C++, [C\#][C] and many other programming languages recognize float as a data type. Other common data types include [int][] and [double][].

浮点数是“浮点数”的缩写。 根据定义，它是编译器中内置的基本数据类型，用于定义带有浮点小数点的数值。 C，C ++， [C＃][C]和许多其他编程语言将float视为数据类型。 其他常见的数据类型包括[int][]和[double][] 。

The float type can represent values ranging from approximately 1.5 x 10\-45 to 3.4 x 1038, with a precision — the limit of digits — of seven. Float can contain up to seven digits in *total*, not just following the decimal point — so, for example, 321.1234567 cannot be stored in float because it has 10 digits. If greater precision—more digits—is necessary, the double type is used.

浮点类型可以表示大约1.5 x 10 \-45到3.4 x 10 38的值 ，精度(数字的极限)为7。 浮点数*总共*可以包含最多七个数字，而不仅仅是小数点后-例如，321.1234567无法存储在浮点数中，因为它有10位数字。 如果需要更高的精度(更多位数)，则使用double型。

## 浮法用途 **(** Uses for Float **)** ##

Float is used mostly in graphic libraries because of their extremely high demand for processing power. Because the range is smaller than in the double type, float has been the better choice when dealing with thousands or millions of floating-point numbers because of its speed. The advantage of float over double is negligible, however, because calculation speed has increased dramatically with new processors. Float is also used in situations that can tolerate rounding errors that occur due to the float precision of seven digits.

浮点数主要用于图形库，因为它们对处理能力的需求非常高。 因为范围比double类型小，所以浮点数因其速度而成为处理数千或数百万个浮点数时的更好选择。 但是，由于新处理器的计算速度已大大提高，因此float超过double的优势可以忽略不计。 浮点数还用于可以容忍由于七位数的浮点数精度而发生的舍入误差的情况。

Currencies are another common use for float. Programmers can define the number of decimal places with additional parameters.

货币是浮点数的另一种常见用法。 程序员可以使用其他参数定义小数位数。

## 浮点数与双精度和整数 **(** Float vs. Double and Int **)** ##

Float and double are similar types. Float is a single-precision, 32-bit floating point data type; double is a double-precision, 64-bit floating point data type. The biggest differences are in precision and range.

浮点型和双精度型是相似的类型。 浮点数是单精度的32位浮点数据类型。 double是双精度64位浮点数据类型。 最大的区别在于精度和范围。

**Double**: The double accommodates 15 to 16 digits, compared with float's seven. The range of double is 5.0 × 10−345 to 1.7 × 10308.

**双**精度型：双精度型可容纳15至16位数字，而浮点数则为7位。 的两倍的范围是5.0×10 \-345至1.7×10 308。

**Int**: Int also deals with data, but it serves a different purpose. Numbers without fractional parts or any need for a decimal point can be used as int. The int type holds only whole numbers, but it takes up less space, the arithmetic is usually faster than with other types, and it uses caches and data transfer bandwidth more efficiently.

**Int** ：Int也处理数据，但是它有不同的用途。 没有小数部分或不需要小数点的数字都可以用作int。 int类型仅保留整数，但占用的空间较小，该算法通常比其他类型更快，并且可以更有效地使用缓存和数据传输带宽。

> 翻译自: [https://www.thoughtco.com/definition-of-float-958293][https_www.thoughtco.com_definition-of-float-958293]

c\#如何定义float变量

[C]: https://www.thoughtco.com/all-about-the-c-programming-language-958330
[int]: https://www.thoughtco.com/definition-of-int-958297
[double]: https://www.thoughtco.com/definition-of-double-958065
[https_www.thoughtco.com_definition-of-float-958293]: https://www.thoughtco.com/definition-of-float-958293