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  1. /********************************************************************
  2. *  Name: Elaine Torrez
  3. *  Date: 2/21/2026
  4. *  Assignment: HW_5f – Recursive Vowel Counter
  5. *
  6. *  Description:
  7. *  This program uses recursion to count the number of vowels
  8. *  in a c_string (null-terminated character array).
  9. ********************************************************************/
  10.  
  11. /* OUTPUT:
  12. Enter a statement:
  13. Say it ain't so Joe.
  14. There are 7 vowels in the statement.
  15. Press any key to continue . . .
  16. */
  17.  
  18. #include <iostream>
  19. #include <cstring>
  20. using namespace std;
  21.  
  22. // Function prototype
  23. int countVowels(char statement[], int index);
  24.  
  25. int main()
  26. {
  27.     // Declare c_string
  28.     char statement[20] = "";   // initialized with null
  29.  
  30.     // Prompt user
  31.     cout << "Enter a statement:" << endl;
  32.  
  33.     // Read input (including spaces)
  34.     cin.getline(statement, 20);
  35.  
  36.     // Call recursive function
  37.     int totalVowels = countVowels(statement, 0);
  38.  
  39.     // Output result
  40.     cout << "There are " << totalVowels 
  41.          << " vowels in the statement." << endl;
  42.  
  43.     cout << "Press any key to continue . . .";
  44.     cin.get();
  45.  
  46.     return 0;
  47. }
  48.  
  49. // Recursive function to count vowels
  50. int countVowels(char statement[], int index)
  51. {
  52.     // Base case: stop at null character
  53.     if (statement[index] == '\0')
  54.         return 0;
  55.  
  56.     // Check if current character is a vowel
  57.     char ch = statement[index];
  58.  
  59.     if (ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O' || ch == 'U' ||
  60.         ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u')
  61.     {
  62.         return 1 + countVowels(statement, index + 1);
  63.     }
  64.     else
  65.     {
  66.         return countVowels(statement, index + 1);
  67.     }
  68. }
Success #stdin #stdout 0s 5328KB
comments (?)
stdin 
Say it ain't so Joe.
stdout 
Enter a statement:
There are 7 vowels in the statement.
Press any key to continue . . .
https://ideone.com/oDGwm7
language:
C++ (gcc 8.3)
created:
23 hours ago
visibility:
public

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