Program to duplicate Vowels in String

Last Updated : 03 Mar, 2020

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++

// 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; 
} 

Java

// 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 

Python3

# 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 

C#

// 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 

Output:

Original String: helloworld
String with Vowels duplicated: heelloowoorld

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