C#|在不使用第三个用户定义变量的情况下交换两个字符串-yiteyi-C++库

给定两个字符串变量a和b，交换这些变量，而不使用C#中的临时变量或第三个变量。允许使用库方法。

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例子：

Input:
a = "Hello"
b = "World"

Output:
Strings before swap: a = Hello and b = World
Strings after swap: a = World and b = Hello

其思想是进行字符串连接，然后使用 子字符串（） 方法来执行此操作。Substring（）方法有两种形式，如下所示：

一串子串方法（startIndex） ：此方法用于从字符串的当前实例检索子字符串。参数“startIndex”将指定子字符串的起始位置，然后子字符串将继续到字符串的末尾。
绳子。子字符串方法（int startIndex，int length） STARTING指定了一个STARTING STARTING STARTING STARTING STARTING STARTING STARTING STARTING STARTING STARTING STARTING STARTING STARTING STARTING STARTING STARTING STARTING STARTING。如果startIndex等于字符串的长度，并且参数长度为零，那么它将不返回任何内容作为子字符串。

算法：

1) Append second string to first string and 
   store in first string:
   a = a + b

2) Call the Substring Method (int startIndex, int length)
   by passing startindex as 0 and length as,
   a.Length - b.Length:
   b = Substring(0, a.Length - b.Length);

3) Call the Substring Method(int startIndex) by passing 
   startindex as b.Length as the argument to store the 
   value of initial b string in a
   a = Substring(b.Length);

                     // C# program to swap two strings                   
                     // without using a temporary variable.                   
                     using                               System;                   
                             
                     class                               GFG {                   
                             
                                         // Main Method                   
                                         public                               static                               void                               Main(String[] args)                   
                                         {                   
                                         // Declare two strings                   
                                         String a =                               "Hello"                               ;                   
                                         String b =                               "Geeks"                               ;                   
                             
                                         // Print String before swapping                   
                                         Console.WriteLine(                               "Strings before swap: a ="                               +                   
                                         " "                               + a +                               " and b = "                               + b);                   
                             
                                         // append 2nd string to 1st                   
                                         a = a + b;                   
                             
                                         // store initial string a in string b                   
                                         b = a.Substring(0, a.Length - b.Length);                   
                             
                                         // store initial string b in string a                   
                                         a = a.Substring(b.Length);                   
                             
                                         // print String after swapping                   
                                         Console.WriteLine(                               "Strings after swap: a ="                               +                   
                                         " "                               + a +                               " and b = "                               + b);                   
                                         }                   
                     }                   

输出：

Strings before swap: a = Hello and b = Geeks
Strings after swap: a = Geeks and b = Hello

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