{"post":"

There are three tricks through which we swap the strings in C++;

Three Character Array Method
Three string method
Inbuilt swap function

\n
Three Character Array Method
\n

In this method,

We copy the contents of the first string to a temporary array.
The, we copy the contents of the second array in the first character array.
Next, we copy the contents of the temporary array to second character array.

Advantage:

We can use this method to reverse the contents of a numeric array too.
We do not need to include string library.

Disadvantage:

High time complexity due to many loops(due to copying array contents).
Very tedious time-consuming.

\n
Three string method
\n

In this method, We use the same technique as above, but we use strings here instead of character arrays.

We include the string library, and make three objects of String class.
We use the inbuilt function strcpy() and follow the naïve method of swapping.

Code:

#include <iostream>\n#include <cstring> //string library
\nusing namespace std;
\nint main() {\r\nint n; //length of string\r\ncin>>n;\r\nchar s1[n];\r\nchar s2[n];\r\nchar s3[n]; //temporary string\r\n//Input String 1\r\ncin>>s1;\r\n//Input String 2\r\ncin>>s2;\r\nstrcpy(s3,s1); //copy contents of s1 in s3\r\nstrcpy(s1,s2);  // similar to  s1=s2\r\nstrcpy(s2,s3);\r\ncout<<s1<<\"\\n\";\r\ncout<<s2;\r\nreturn 0;\r\n}

Advantage:

It is faster than the previous method.

Disadvantage:

We need to use three strings, which is a waste of memory.

\n
Inbuilt swap function
\n

In this method, we use the inbuilt swap function to perform the task.

We include the string library and make two string objects.
Then, we make use of swap() function and output the strings.

Code:

#include <iostream>\r\n#include <string>\r\nusing namespace std;\nint main() {\r\nstring str1;
\nstring str2;\r\n//input string 1\r\ncin&gt;&gt;str1;\r\n//input string 2\r\ncin&gt;&gt;str2;\r\n\r\nstr1.swap(str2); //swap contents of str1 and str2\r\ncout&lt;&lt;str1&lt;&lt;\"\\n\";\r\ncout&lt;&lt;str2;\n
\nreturn 0;
\n}

Advantage:

It is the fastest of all.
It uses only two strings to execute the task.

\n","title":"Program to Swap two strings in C++","authorDetails":{"name":"Juhi Kamdar","slug":"juhi-kamdar"},"description":"Learn to write a Program to Swap two strings in C++ using Three Character Array Method, Three string method and Inbuilt swap function.","slug":"cpp/examples/swapping-of-two-strings/","articleId":"636a83457bb1ce5072622c17","bookmarkStatus":{"isBookmarked":false,"bookmarkId":null}}