Convert given Array of Strings to a Camel Case format sentence

Last Updated : 23 Jul, 2025

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 <bits/stdc++.h>
using namespace std;

// Function to convert the given array
// of strings into a sentence in the
// Camel Case formatting
string convertCase(vector<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.size() > 0) {
            ans += ' ';
        }

        // Insert the first character of arr[i]
        ans += toupper(arr[i][0]);

        // 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<string> 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# 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][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][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

<script>
    // JavaScript program of the above approach

    // Function to convert the given array
    // of strings into a sentence in the
    // Camel Case formatting
    const convertCase = (arr, N) => {
        // Stores the final sentence
        let ans = "";

        // Loop to iterate over the array
        for (let 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 += (arr[i][0]).toUpperCase();

            // Loop to iterate over current array element
            for (let 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 += ' ';
                    ans += (arr[i][j + 1]).toUpperCase();
                    j++;
                }

                // Otherwise the characters
                // must be in the lower case
                else {
                    ans += (arr[i][j]).toLowerCase();
                }
            }
        }

        // Return Answer
        return ans;
    }

    // Driver program

    let arr = [
        "AnNiruddHA Routh",
        "LOVES", "to",
        "COdE everyDAY"
    ];
    let N = arr.length;

    document.write(convertCase(arr, N));

// This code is contributed by rakeshsahni

</script>

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)

aniruddharouth

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