Question

Write code in C++, using the correct headers not the catchall std/bitsc:

Write a recursive, bool-valued function, containsVowel, that accepts a string and returns true if the string contains a vowel.

A string contains a vowel if:

• The first character of the string is a vowel, or
• The rest of the string (beyond the first character) contains a vowel

it should be making use of true/false as it is a boolean, substr(), find, and !=.

Answer 1

#include<iostream>
using namespace std;

bool containsVowel(string s){
   if(s.length()>0){
      char ch = s[0];
      if(ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u' || ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O' || ch == 'U'){
         return true;
      }
      else{
         return containsVowel(s.substr(1,s.length()-1));
      }
   }
   else{
      return false;
   }
}

int main() 
{
    cout<<containsVowel("yes");
    return 0;
}

1