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Replace All Vowels in a String

Certification: Basic Level Accuracy: 87.5% Submissions: 8 Points: 10

Write a C++ program that replaces all vowels in a given string with a specific character.

Example 1
    
  
  • Input: string = "Hello World", replacement = '*'
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  • Output: "H*ll* W*rld"
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  • Explanation: 
      
    
    • Step 1: Identify all vowels (a, e, i, o, u) in the input string.
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    • Step 2: Replace each vowel with the replacement character '*'.
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    • Step 3: Return the modified string.
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Example 2
    
  
  • Input: string = "C++ is fun", replacement = '#'
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  • Output: "C++ #s f#n"
    • 
  
  • Explanation: 
      
    
    • Step 1: Identify all vowels (a, e, i, o, u) in the input string.
      • 
    
    • Step 2: Replace each vowel with the replacement character '#'.
      • 
    
    • Step 3: Return the modified string.
      • 
  
    •
Constraints
    
  
  • 1 ≤ len(string) ≤ 10^6
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  • String contains printable ASCII characters
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  • Time Complexity: O(n), where n is the length of the string
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  • Space Complexity: O(n)
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Hint
Solution

Solution Hints

    
  
  • Iterate through the string and replace each vowel with the specified character.
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  • Use a set or string of vowels to check if a character is a vowel.
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  • Handle both lowercase and uppercase vowels.
    •

Steps to solve by this approach:

 Step 1: Define a function replaceVowels that takes a constant string reference and a character.
 Step 2: Create a string containing all vowels for checking.
 Step 3: Make a copy of the input string to modify.
 Step 4: Iterate through each character in the result string.
 Step 5: Check if the current character is a vowel using string::find.
 Step 6: If it's a vowel, replace it with the specified character.
 Step 7: Return the modified string.

Submitted Code :