# Convert given Array of Strings to a Camel Case format sentence

• Difficulty Level : Basic
• Last Updated : 12 Dec, 2021

Given an array arr[] of N strings, each containing words with upper or lower case English alphabets, the task is to create a sentence in a Camel Case format using them.

Example:

Input: arr[] = {“AnNiruddHA Routh”, “LOVES”, “to”, “COdE everyDAY””}
Output: AniruddhaRouth Loves To Code Everyday
Explanation: The above sentence is the merged sentence of all the words in the given order in Camel Case.

Input: arr[] = {“I”, “GOT”, “iNtErN”, “at geekSfoRgeekS”}
Output: I Got Intern At Geeksforgeeks

Approach: The given problem can be solved by traversing each word one by one and inserting every character in the Camel case format into a resultant string, as shown in steps below:

• Create an empty string to store the resultant string
• Traverse the array of strings word by word, and for each word:
• If the character is at first index, insert the current character in upper case format
• Else insert all other characters in lower case format
• Whenever a word ends, add a space to the string, except for the last word (insert a full stop in this case).
• Return the resultant string at the end.

Below is the implementation of the above approach:

## C++

 `// C++ program of the above approach` `#include ` `using` `namespace` `std;`   `// Function to convert the given array` `// of strings into a sentence in the` `// Camel Case formatting` `string convertCase(vector arr, ``int` `N)` `{` `    ``// Stores the final sentence` `    ``string ans = ``""``;`   `    ``// Loop to iterate over the array` `    ``for` `(``int` `i = 0; i < N; i++) {`   `        ``// If the current word is not the 1st` `        ``// word, insert space` `        ``if` `(ans.size() > 0) {` `            ``ans += ``' '``;` `        ``}`   `        ``// Insert the first character of arr[i]` `        ``ans += ``toupper``(arr[i]);`   `        ``// Loop to iterate over current array element` `        ``for` `(``int` `j = 1; j < arr[i].size(); j++) {`   `            ``// If a space is found,` `            ``// the next character` `            ``// should be in upper case` `            ``if` `(arr[i][j] == ``' '``) {` `                ``ans += ``' '``;` `                ``ans += ``toupper``(arr[i][j + 1]);` `                ``j++;` `            ``}`   `            ``// Otherwise the characters` `            ``// must be in the lower case` `            ``else` `{` `                ``ans += ``tolower``(arr[i][j]);` `            ``}` `        ``}` `    ``}`   `    ``// Return Answer` `    ``return` `ans;` `}`   `// Driver program` `int` `main()` `{` `    ``vector arr{` `        ``"AnNiruddHA Routh"``,` `        ``"LOVES"``, ``"to"``,` `        ``"COdE everyDAY"` `    ``};` `    ``int` `N = arr.size();`   `    ``cout << convertCase(arr, N);`   `    ``return` `0;` `}`

## Java

 `// Java code for the above approach` `import` `java.util.*;`   `class` `GFG{`   `// Function to convert the given array` `// of strings into a sentence in the` `// Camel Case formatting` `static` `String convertCase(String[] arr, ``int` `N)` `{` `    `  `    ``// Stores the final sentence` `    ``String ans = ``""``;`   `    ``// Loop to iterate over the array` `    ``for``(``int` `i = ``0``; i < N; i++) ` `    ``{` `        `  `        ``// If the current word is not the 1st` `        ``// word, insert space` `        ``if` `(ans.length() > ``0``) ` `        ``{` `            ``ans += ``' '``;` `        ``}`   `        ``// Insert the first character of arr[i]` `        ``ans += Character.toUpperCase(arr[i].charAt(``0``));`   `        ``// Loop to iterate over current array element` `        ``for``(``int` `j = ``1``; j < arr[i].length(); j++)` `        ``{` `            `  `            ``// If a space is found,` `            ``// the next character` `            ``// should be in upper case` `            ``if` `(arr[i].charAt(j) == ``' '``)` `            ``{` `                ``ans += ``' '``;` `                ``char` `t = Character.toUpperCase(` `                    ``arr[i].charAt(j + ``1``));` `                ``ans += t;` `                ``j++;` `            ``}`   `            ``// Otherwise the characters` `            ``// must be in the lower case` `            ``else` `            ``{` `                ``ans += Character.toLowerCase(` `                    ``arr[i].charAt(j));` `            ``}` `        ``}` `    ``}`   `    ``// Return Answer` `    ``return` `ans;` `}`   `// Driver code` `public` `static` `void` `main(String[] args)` `{` `    ``String[] arr = { ``"AnNiruddHA Routh"``, ``"LOVES"``, ``"to"``,` `                     ``"COdE everyDAY"` `};` `    ``int` `N = arr.length;`   `    ``System.out.println(convertCase(arr, N));` `}` `}`   `// This code is contributed by Potta Lokesh`

## Python3

 `# Python3 program of the above approach`   `# Function to convert the given array` `# of strings into a sentence in the` `# Camel Case formatting` `def` `convertCase(arr, N) :` `    `  `    ``# Stores the final sentence` `    ``ans ``=` `"";`   `    ``# Loop to iterate over the array` `    ``for` `i ``in` `range``(N) :`   `        ``# If the current word is not the 1st` `        ``# word, insert space` `        ``if` `(``len``(ans) > ``0``) :` `            ``ans ``+``=` `' '``;`   `        ``# Insert the first character of arr[i]` `        ``ans ``+``=` `arr[i][``0``].upper();` `    `  `        ``j ``=` `1` `        `  `        ``# Loop to iterate over current array element` `        ``while` `j < ``len``(arr[i]) :` `            `  `            ``# If a space is found,` `            ``# the next character` `            ``# should be in upper case` `            ``if` `(arr[i][j] ``=``=` `' '``) :` `                ``ans ``+``=` `' '``;` `                ``ans ``+``=` `arr[i][j ``+` `1``].upper();` `                ``j ``+``=` `1``;`   `            ``# Otherwise the characters` `            ``# must be in the lower case` `            ``else` `:` `                ``ans ``+``=` `arr[i][j].lower();` `            `  `            ``j ``+``=` `1``;`   `    ``# Return Answer` `    ``return` `ans;`   `# Driver program` `if` `__name__ ``=``=` `"__main__"` `:`   `    ``arr ``=` `[``"AnNiruddHA Routh"``,``"LOVES"``, ``"to"``,``"COdE everyDAY"``]` `    ``N ``=` `len``(arr);` `    ``print``(convertCase(arr, N));`   `    ``# This code is contributed by AnkThon`

## C#

 `// C# code for the above approach` `using` `System;`   `class` `GFG` `{`   `    ``// Function to convert the given array` `    ``// of strings into a sentence in the` `    ``// Camel Case formatting` `    ``static` `String convertCase(String[] arr, ``int` `N)` `    ``{`   `        ``// Stores the final sentence` `        ``String ans = ``""``;`   `        ``// Loop to iterate over the array` `        ``for` `(``int` `i = 0; i < N; i++)` `        ``{`   `            ``// If the current word is not the 1st` `            ``// word, insert space` `            ``if` `(ans.Length > 0)` `            ``{` `                ``ans += ``' '``;` `            ``}`   `            ``// Insert the first character of arr[i]` `            ``ans += ``char``.ToUpper(arr[i]);`   `            ``// Loop to iterate over current array element` `            ``for` `(``int` `j = 1; j < arr[i].Length; j++)` `            ``{`   `                ``// If a space is found,` `                ``// the next character` `                ``// should be in upper case` `                ``if` `(arr[i][j] == ``' '``)` `                ``{` `                    ``ans += ``' '``;` `                    ``char` `t = ``char``.ToUpper(arr[i][j + 1]);` `                    ``ans += t;` `                    ``j++;` `                ``}`   `                ``// Otherwise the characters` `                ``// must be in the lower case` `                ``else` `                ``{` `                    ``ans += ``char``.ToLower(arr[i][j]);` `                ``}` `            ``}` `        ``}`   `        ``// Return Answer` `        ``return` `ans;` `    ``}`   `    ``// Driver code` `    ``public` `static` `void` `Main()` `    ``{` `        ``String[] arr = { ``"AnNiruddHA Routh"``, ``"LOVES"``, ``"to"``,` `                     ``"COdE everyDAY"` `};` `        ``int` `N = arr.Length;`   `        ``Console.Write(convertCase(arr, N));` `    ``}` `}`   `// This code is contributed by gfgking`

## Javascript

 ``

Output

`Anniruddha Routh Loves To Code Everyday`

Time Complexity: O(N*M), where M is the average length of a string over all the given strings
Auxiliary Space: O(N*M)

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