翻倍。C# 中的方法与示例的比较
原文:https://www . geeksforgeeks . org/double-compare to-method-in-c-sharp-with-examples/
翻倍。比较方法用于将当前实例与指定对象或双对象进行比较。它将返回一个整数，显示当前实例的值是大于、小于还是等于指定对象的值还是双对象的值。此方法的重载列表中有 2 种方法，如下所示:
-
比较(双)法 *CompareTo(Object) Method
双倍。比较(双)法
翻倍。CompareTo() 方法用于将当前实例与指定的双精度浮点数进行比较，并返回一个整数，该整数显示此实例的值是小于、等于还是大于指定的双精度浮点数的值。
语法:
cs public int CompareTo (double value);这里，需要一个双精度浮点数来进行比较。
返回值:这个方法返回一个有符号的数字，表示这个实例和值的相对值。
- 小于零:此实例小于值或此实例不是数字(NaN)，值是数字。
- 零:此实例等于值，或者此实例和值都不是数字(NaN)、正数或负数。
- 大于零:此实例大于值，或者此实例是数字，而值不是数字(NaN)。
下面的程序说明了 Double 的使用。比较(双)方法:
例 1:
```cs // C# program to demonstrate the // Double.CompareTo(Double) // Method using System; using System.Globalization;
class GFG {
// Main Method public static void Main() { // Declaring and initializing value1 double value1 = 10d;
// Declaring and initializing value2 double value2 = 20d;
// compare both double value // using CompareTo() method int status = value1.CompareTo(value2);
// checking the status if (status > 0) Console.WriteLine("{0} is greater than {1}", value1, value2); else if (status < 0) Console.WriteLine("{0} is less than {1}", value1, value2); else Console.WriteLine("{0} is equal to {1}", value1, value2); } } ```
Output:
```cs 10 is less than 20
```
例 2:
```cs // C# program to demonstrate the // Double.CompareTo(Double) // Method using System; using System.Globalization;
class GFG {
// Main Method public static void Main() { // calling get() method get(5d, 7d); get(5.5d, 4.5d); get(10d, 20d); get(7.5d, 19.5d); }
// defining get() method public static void get(double value1, double value2) {
// compare both double value // using CompareTo() method int status = value1.CompareTo(value2);
// checking the status if (status > 0) Console.WriteLine("{0} is greater than {1}", value1, value2); else if (status < 0) Console.WriteLine("{0} is less than {1}", value1, value2); else Console.WriteLine("{0} is equal to {1}", value1, value2); } } ```
Output:
```cs 5 is less than 7 5.5 is greater than 4.5 10 is less than 20 7.5 is less than 19.5
```
双倍。比较对象方法
翻倍。CompareTo() 方法用于将当前实例与指定对象进行比较，并返回一个整数，该整数指示当前实例的值是小于、等于还是大于指定对象的值。
语法:
cs public int CompareTo (object value);这里，它需要一个对象进行比较，或者为 null。
返回值:这个方法返回一个有符号的数字，表示这个实例和值的相对值。
- 小于零:此实例小于值或此实例不是数字(NaN)，值是数字。
- 零:此实例等于值，或者此实例和值都不是数字(NaN)、正数或负数。
- 大于零:此实例大于值，或者此实例是数字，而值不是数字(NaN)。
异常:如果值不是 Double，则抛出参数异常。
下面的程序说明了 Double 的使用。比较(对象)方法:
例 1:
```cs // C# program to demonstrate the // Double.CompareTo(object) // Method using System; using System.Globalization;
class GFG {
// Main Method public static void Main() { try {
// Declaring and initializing value1 double value1 = 10d;
// Declaring and initializing value2 object value2 = 20d;
// compare both double value // using CompareTo() method int status = value1.CompareTo(value2);
// checking the status if (status > 0) Console.WriteLine("{0} is greater than {1}", value1, value2); else if (status < 0) Console.WriteLine("{0} is less than {1}", value1, value2); else Console.WriteLine("{0} is equal to {1}", value1, value2); }
catch (ArgumentException e) { Console.WriteLine("value2 must be double"); Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } } ```
Output:
```cs 10 is less than 20
```
示例 2: 适用于参数异常
```cs // C# program to demonstrate the // Double.CompareTo(object) // Method using System; using System.Globalization;
class GFG {
// Main Method public static void Main() { try {
// Declaring and initializing value1 double value1 = 10d;
// Declaring and initializing value2 object value2 = 1 / 3;
// compare both double value // using CompareTo() method int status = value1.CompareTo(value2);
// checking the status if (status > 0) Console.WriteLine("{0} is greater than {1}", value1, value2);
else if (status < 0) Console.WriteLine("{0} is less than {1}", value1, value2); else Console.WriteLine("{0} is equal to {1}", value1, value2); }
catch (ArgumentException e) { Console.WriteLine("value2 must be double"); Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } } ```
Output:
```cs value2 must be double Exception Thrown: System.ArgumentException
```
参考:
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