Given a sentence having lowercase characters, the task is to convert it to Camel Case. In Camel Case, words are joined without spaces, the first word keeps its original case, and each subsequent word starts with an uppercase letter.

Examples:

Input: "i got intern at geeksforgeeks"
Output: "iGotInternAtGeeksforgeeks"
Input: "here comes the garden"
Output: "hereComesTheGarden"

Try It Yourself

Approach:

The idea is to traverse the sentence and each time a space is encountered, remove it and capitalize the next character. We use a flag, capitalizeNext, to track when to capitalize the next character. When a space is encountered, we skip it and set capitalizeNext to true. Once a character is found, we capitalize it and set capitalizeNext back to false.

C++

// C++ program to convert given sentence to camel case

#include <iostream>
using namespace std;

string convertToCamelCase(string &s) {
    string res = "";

    // Flag to indicate when to capitalize the next letter
    bool capitalizeNext = false;

    for(int i = 0; i < s.length(); i++) {

        // If we encounter a space, set the flag to capitalize
        // the next character
        if (s[i] == ' ') {
            capitalizeNext = true;
        }

        // If the flag is set, capitalize the current character
        else if (capitalizeNext == true) {
            res += toupper(s[i]);

            // Reset the flag after capitalization
            capitalizeNext = false;
        }

        // Otherwise, just add the current character to the result
        else {
            res += s[i];
        }
    }

    return res;
}

int main() {
    string s = "i got intern at geeksforgeeks";
    cout << convertToCamelCase(s);
    return 0;
}

Java

// Java program to convert given sentence to camel case

class GfG {
    static String convertToCamelCase(String s) {
        StringBuilder res = new StringBuilder();

        // Flag to indicate when to capitalize the next letter
        boolean capitalizeNext = false;

        for (int i = 0; i < s.length(); i++) {

            // If we encounter a space, set the flag to capitalize
            // the next character
            if (s.charAt(i) == ' ') {
                capitalizeNext = true;
            }

            // If the flag is set, capitalize the current character
            else if (capitalizeNext == true) {
                res.append(Character.toUpperCase(s.charAt(i)));

                // Reset the flag after capitalization
                capitalizeNext = false;
            }

            // Otherwise, just add the current character to the result
            else {
                res.append(s.charAt(i));
            }
        }

        return res.toString();
    }

    public static void main(String[] args) {
        String s = "i got intern at geeksforgeeks";
        System.out.println(convertToCamelCase(s));
    }
}

Python

# Python program to convert given sentence to camel case

def convertToCamelCase(s):
    res = []

    # Flag to indicate when to capitalize the next letter
    capitalizeNext = False

    for i in range(len(s)):

        # If we encounter a space, set the flag to capitalize
        # the next character
        if s[i] == ' ':
            capitalizeNext = True

        # If the flag is set, capitalize the current character
        elif capitalizeNext:
            res.append(s[i].upper())

            # Reset the flag after capitalization
            capitalizeNext = False

        # Otherwise, just add the current character to the result
        else:
            res.append(s[i])

    return ''.join(res)

if __name__ == "__main__":
	s = "i got intern at geeksforgeeks"
	print(convertToCamelCase(s))

// C# program to convert given sentence to camel case

using System;
using System.Text;

class GfG {
    static string convertToCamelCase(string s) {
        StringBuilder res = new StringBuilder();

        // Flag to indicate when to capitalize the next letter
        bool capitalizeNext = false;

        for (int i = 0; i < s.Length; i++) {

            // If we encounter a space, set the flag to capitalize
            // the next character
            if (s[i] == ' ') {
                capitalizeNext = true;
            }

            // If the flag is set, capitalize the current character
            else if (capitalizeNext == true) {
                res.Append(Char.ToUpper(s[i]));

                // Reset the flag after capitalization
                capitalizeNext = false;
            }

            // Otherwise, just add the current character to result
            else {
                res.Append(s[i]);
            }
        }

        return res.ToString();
    }

    static void Main() {
        string s = "i got intern at geeksforgeeks";
        Console.WriteLine(convertToCamelCase(s));
    }
}

JavaScript

// JavaScript program to convert given sentence to camel case

function convertToCamelCase(s) {
    let res = [];

    // Flag to indicate when to capitalize the next letter
    let capitalizeNext = false;

    for (let i = 0; i < s.length; i++) {

        // If we encounter a space, set the flag to capitalize
        // the next character
        if (s[i] === ' ') {
            capitalizeNext = true;
        }

        // If the flag is set, capitalize the current character
        else if (capitalizeNext === true) {
            res.push(s[i].toUpperCase());

            // Reset the flag after capitalization
            capitalizeNext = false;
        }

        // Otherwise, just add the current character to the result
        else {
            res.push(s[i]);
        }
    }

    return res.join('');
}

// Driver Code
let s = "i got intern at geeksforgeeks";
console.log(convertToCamelCase(s));

Output

iGotInternAtGeeksforgeeks

Time Complexity: O(n), where n is the length of input sentence.
Auxiliary Space: O(n), to store the final result.

Camel case of a given sentence

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