Program to duplicate Vowels in String

Given a string “str”, the task is to duplicate vowels in this string.

Examples:

Input: str = "geeks"
Output: geeeeks

Input: str = "java"
Output: jaavaa

Approach: Iterate the string using a loop. Check if the character is a vowel and duplicate it. Return
then print the resultant string.

Below is the implementation of the above approach:

C++

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// C++ program for printing string
// with duplicate vowels
  
#include <bits/stdc++.h>
using namespace std;
  
// Function to check for the Vowel
bool isVowel(char ch)
{
    ch = toupper(ch);
    return (ch == 'A' || ch == 'E'
            || ch == 'I' || ch == 'O'
            || ch == 'U');
}
  
// Function to get the resultant string
// with vowels duplicated
string duplicateVowels(string str)
{
    int t = str.length();
  
    // Another string to store
    // the resultant string
    string res = "";
  
    // Loop to check for each character
    for (int i = 0; i < t; i++) {
        if (isVowel(str[i])) {
            res += str[i];
        }
        res += str[i];
    }
  
    return res;
}
  
// Driver Code
int main()
{
    string str = "helloworld";
  
    // Print the original string
    cout << "Original String: "
         << str << endl;
  
    string res = duplicateVowels(str);
  
    // Print the resultant string
    cout << "String with Vowels duplicated: "
         << res << endl;
}

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Java

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// Java program for printing string 
// with duplicate vowels 
import java.util.*;
  
class GFG 
{
  
    // Function to check for the Vowel
    static boolean isVowel(char ch) 
    {
        ch = Character.toUpperCase(ch);
        return (ch == 'A' || ch == 'E' || 
                ch == 'I' || ch == 'O' || ch == 'U');
    }
  
    // Function to get the resultant string
    // with vowels duplicated
    static String duplicateVowels(String str)
    {
        int t = str.length();
  
        // Another string to store
        // the resultant string
        String res = "";
  
        // Loop to check for each character
        for (int i = 0; i < t; i++) 
        {
            if (isVowel(str.charAt(i)))
                res += str.charAt(i);
            res += str.charAt(i);
        }
        return res;
    }
  
    // Driver Code
    public static void main(String[] args) 
    {
        String str = "helloworld";
  
        // Print the original string
        System.out.println("Original String: " + str);
        String res = duplicateVowels(str);
  
        // Print the resultant string
        System.out.println("String with Vowels duplicated: " + res);
    }
}
  
// This code is contributed by
// sanjeev2552

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Python3

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# Python3 program for printing String
# with duplicate vowels
  
  
# Function to check for the Vowel
def isVowel(ch):
    ch = ch.upper()
    if (ch == 'A' or ch == 'E' or 
        ch == 'I' or ch == 'O' or 
        ch == 'U'):
        return True
    else:
        return False
  
# Function to get the resultant String
# with vowels duplicated
def duplicateVowels(S):
    t = len(S)
  
    # Another to store
    # the resultant String
    res = ""
  
    # Loop to check for each character
    for i in range(t):
        if (isVowel(S[i])):
            res += S[i]
        res += S[i]
  
    return res
  
# Driver Code
S = "helloworld"
  
# Print the original String
print("Original String: ", S)
  
res = duplicateVowels(S)
  
# Print the resultant String
print("String with Vowels duplicated: ", res)
  
# This code is contributed by Mohit Kumar

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C#

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// C# program for printing string 
// with duplicate vowels 
using System;
  
class GFG 
{
  
    // Function to check for the Vowel
    static bool isVowel(char ch) 
    {
        ch = char.ToUpper(ch);
        return (ch == 'A' || ch == 'E' || 
                ch == 'I' || ch == 'O' || ch == 'U');
    }
  
    // Function to get the resultant string
    // with vowels duplicated
    static String duplicateVowels(String str)
    {
        int t = str.Length;
  
        // Another string to store
        // the resultant string
        String res = "";
  
        // Loop to check for each character
        for (int i = 0; i < t; i++) 
        {
            if (isVowel(str[i]))
                res += str[i];
            res += str[i];
        }
        return res;
    }
  
    // Driver Code
    public static void Main(String[] args) 
    {
        String str = "helloworld";
  
        // Print the original string
        Console.WriteLine("Original String: " + str);
        String res = duplicateVowels(str);
  
        // Print the resultant string
        Console.WriteLine("String with Vowels duplicated: " + res);
    }
}
  
// This code is contributed by Rajput-Ji

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Output:

Original String: helloworld
String with Vowels duplicated: heelloowoorld

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