# Interchanging first and second halves of strings

• Last Updated : 01 Aug, 2022

Given two strings and . Create two new strings by exchanging the first half and second half of one of the strings with the first half and second half of the other string respectively.

Examples:

```Input : fighter
warrior
Output :warhter
figrior

Input :remuneration
day
Output :dration
remuneay```

In the first example, fighter is made up of two parts fig and hter. Similarly, warrior is also made up of two parts war and rior. Interchange the first part of both the strings to create two new strings warhter and figrior. Similarly, in the second example first part of remuneration which is remune is exchanged with the first part of day to create dration and remuneay.

Implementation:

## C++

 `// CPP code to create two new strings``// by swapping first and second halves``#include``using` `namespace` `std;` `// Function to concatenate two``// different halves of given strings``void` `swapTwoHalves(string a , string b)``{``    ``int` `la = a.length();``    ``int` `lb = b.length();``    ` `    ``// Creating new strings by``    ``// exchanging the first half``    ``// of a and b. Please refer below for``    ``// details of substr.``    ``// https://www.geeksforgeeks.org/stdsubstr-in-ccpp/``    ``string c = a.substr(0, la/2) +``               ``b.substr(lb/2, lb);``    ``string d = b.substr(0, lb/2) +``               ``a.substr(la/2, la);``        ` `    ``cout << c << endl << d << endl;``}` `// Driver function``int` `main()``{``    ``string a = ``"remuneration"``;``    ``string b = ``"day"``;``    ``swapTwoHalves(a, b);   ``    ``return` `0;``}`

## Java

 `// Java code to create two new strings``// by swapping first and second halves``import` `java.io.*;``class` `ns``{``   ` `    ``// Function to concatenate two``    ``// different halves of given strings``    ``public` `static` `void` `swapTwoHalves(String a,``                                     ``String b)``    ``{``        ``int` `la = a.length();``        ``int` `lb = b.length();``        ` `        ``// Creating new strings by``        ``// exchanging the first half``        ``// of a and b. Please refer below``        ``// for details of substring.``        ``// https://www.geeksforgeeks.org/java-lang-string-substring-java/``        ``String c = a.substring(``0``,la/``2``) +``                   ``b.substring(lb/``2``,lb);``        ``String d = b.substring(``0``,lb/``2``) +``                  ``a.substring(la/``2``,la);``            ` `        ``System.out.println(c + ``"\n"` `+ d);``    ``}``    ``public` `static` `void` `main (String args[])``    ``{``        ``// Given strings``        ``String a = ``"remuneration"``;``        ``String b = ``"day"``;``        ` `        ``// Calling function``        ``swapTwoHalves(a, b);``    ``}``}`

## Python3

 `# Python 3 code to create two new strings``# by swapping first and second halves`  `# Function to concatenate two``# different halves of given strings``def` `swapTwoHalves( a ,b) :``    ``la ``=` `len``(a)``    ``lb ``=` `len``(b)``     ` `    ``# Creating new strings by``    ``# exchanging the first half``    ``# of a and b. Please refer below for``    ``# details of substr.``    ``# https://www.geeksforgeeks.org/stdsubstr-in-ccpp/``    ``c ``=` `a[``0``:la``/``/``2``] ``+` `b[lb``/``/``2``: lb]``    ``d ``=` `b[``0``: lb``/``/``2``] ``+` `a[la``/``/``2``: la]``         ` `    ``print``( c, ``"\n"` `, d )`` ` `# Driver function``a ``=` `"remuneration"``b ``=` `"day"``swapTwoHalves(a, b)`  `# This code is contributed by Nikita Tiwari`

## C#

 `// C# code to create two``// new strings by swapping``// first and second halves``using` `System;` `class` `GFG``{``    ``// Function to concatenate``    ``// two different halves``    ``// of given strings``    ``static` `void` `swapTwoHalves(``string` `a ,``                              ``string` `b)``    ``{``        ``int` `la = a.Length;``        ``int` `lb = b.Length;``        ` `        ``// Creating new strings``        ``// by exchanging the``        ``// first half of a and b.``        ``string` `c = a.Substring(0, la / 2) +``                   ``b.Substring(lb / 2,``                               ``lb / 2 + 1);``        ``string` `d = b.Substring(0, lb / 2) +``                   ``a.Substring(la / 2,``                               ``la / 2);``            ` `        ``Console.Write (c + ``"\n"` `+``                       ``d + ``"\n"``);``    ``}    ``    ` `    ``// Driver Code``    ``static` `void` `Main()``    ``{``        ``string` `a = ``"remuneration"``;``        ``string` `b = ``"day"``;``        ``swapTwoHalves(a, b);``    ``}``}` `// This code is contributed by``// Manish Shaw(manishshaw1)`

## PHP

 ``

## Javascript

 ``

Output

```remuneay
dration```

Time Complexity: O(n), time required for substr function
Auxiliary Space: O(n)

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