C#中的数字字面量后缀及其作用 | Numeric Literal Suffixes and Their Usage in C#
在C#编程中,我们经常需要使用不同类型的数字,如整数、浮点数和高精度数字等。为了方便表示这些数字并明确其数据类型,C#提供了各种数字字面量后缀。本文将通过实例详细介绍这些后缀的作用和用法。
When programming in C#, we often need to use different types of numbers, such as integers, floating-point numbers, and high-precision numbers. To facilitate the representation of these numbers and clarify their data types, C# provides various numeric literal suffixes. This article will introduce the usage and effects of these suffixes in detail through examples.
1. m或M后缀表示decimal类型 | m or M Suffix for decimal Type
decimal类型用于表示高精度的十进制数字。在C#中,我们可以使用m或M后缀来指定一个字面量为decimal类型。
The decimal type is used to represent high-precision decimal numbers. In C#, we can use the m or M suffix to specify a literal as the decimal type.
decimal price = 9.99m;
decimal tax = 1.50M;
decimal total = price + tax;
Console.WriteLine($"Total: {total}"); // 输出: Total: 11.49
2. f或F后缀表示float类型 | f or F Suffix for float Type
float类型用于表示单精度浮点数。通过在数字字面量末尾添加f或F后缀,我们可以将其指定为float类型。
The float type is used to represent single-precision floating-point numbers. By appending the f or F suffix to the end of a numeric literal, we can specify it as the float type.
float pi = 3.14159f;
float radius = 2.5F;
float area = pi * radius * radius;
Console.WriteLine($"Area: {area}"); // 输出: Area: 19.63495
3. d或D后缀表示double类型 | d or D Suffix for double Type
double类型用于表示双精度浮点数。如果没有指定后缀,数字字面量默认为double类型。我们也可以显式地使用d或D后缀。
The double type is used to represent double-precision floating-point numbers. If no suffix is specified, the numeric literal defaults to the double type. We can also explicitly use the d or D suffix.
double distance = 1000.0;
double time = 3600d;
double speed = distance / time;
Console.WriteLine($"Speed: {speed} m/s"); // 输出: Speed: 0.277777777777778 m/s
4. u或U后缀表示uint类型 | u or U Suffix for uint Type
uint类型表示32位无符号整数。通过在整数字面量末尾添加u或U后缀,我们可以将其指定为uint类型。
The uint type represents a 32-bit unsigned integer. By appending the u or U suffix to the end of an integer literal, we can specify it as the uint type.
uint age = 25u;
uint max = uint.MaxValue;
Console.WriteLine($"Age: {age}, Max: {max}"); // 输出: Age: 25, Max: 4294967295
5. l或L后缀表示long类型 | l or L Suffix for long Type
long类型表示64位有符号整数。通过在整数字面量末尾添加l或L后缀,我们可以将其指定为long类型。
The long type represents a 64-bit signed integer. By appending the l or L suffix to the end of an integer literal, we can specify it as the long type.
long population = 7800000000L;
long milliseconds = 1000L * 60 * 60 * 24;
Console.WriteLine($"Population: {population}, Milliseconds in a day: {milliseconds}");
// 输出: Population: 7800000000, Milliseconds in a day: 86400000
6. ul、uL、Ul、UL、lu、Lu、lU或LU后缀表示ulong类型 | ul, uL, Ul, UL, lu, Lu, lU, or LU Suffix for ulong Type
ulong类型表示64位无符号整数。通过在整数字面量末尾添加ul、uL、Ul、UL、lu、Lu、lU或LU后缀,我们可以将其指定为ulong类型。
The ulong type represents a 64-bit unsigned integer. By appending the ul, uL, Ul, UL, lu, Lu, lU, or LU suffix to the end of an integer literal, we can specify it as the ulong type.
ulong bytesInTB = 1024uL * 1024 * 1024 * 1024;
ulong maxValue = ulong.MaxValue;
Console.WriteLine($"Bytes in a TB: {bytesInTB}, Max Value: {maxValue}");
// 输出: Bytes in a TB: 1099511627776, Max Value: 18446744073709551615
在编写C#代码时,合理使用数字字面量后缀可以让编译器正确推断数据类型,减少隐式类型转换带来的潜在问题。同时,明确指定数据类型也有助于提高代码的自文档化程度,使其更易于理解和维护。
When writing C# code, proper use of numeric literal suffixes allows the compiler to correctly infer data types and reduces potential issues caused by implicit type conversions. Meanwhile, explicitly specifying data types also helps improve the self-documentation of the code, making it easier to understand and maintain.
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