Write a program that reads a string and outputs the number of times each lowercase vowel appears in it. Your program must contain a function with one of its parameters as a string variable and return the number of times each lowercase vowel appears in it. Also write a program to test your function. (Note that if str is a variable of type string, then str. at(i) returns the character at the ith position. The position of the first character is 0. Also, str. length() returns the length of the str, that is, the number of characters in str.)

Here the code is given as follows,

Explanation:

#include <iostream>

#include <string>

using namespace std;

void Vowels(string userString);

int main()

{

   string userString;

   //to get string from user

   cout << "Please enter a string: ";

   getline(cin,userString,'\n');

   Vowels(userString);

   return 0;

}

void Vowels(string userString)

{

   char currentChar;

   //variables to hold the number of instances of each vowel

   int a = 0, e = 0, i = 0, o = 0, u = 0;  

   for (int x = 0; x < userString.length(); x++)  

   {

       currentChar = userString.at(x);

       switch (currentChar)  

       {

           case 'a':

               a += 1;

               break;

           case 'e':

               e += 1;

               break;

           case 'i':

               i += 1;

               break;

           case 'o':

               o += 1;

               break;

           case 'u':

               u += 1;

               break;

           default:

               break;

       }

   }

   // to print no of times a vowels appears in the string

   cout << "Out of the " << userString.length() << " characters you entered." << endl;

   cout << "Letter a = " << a << " times" << endl;

   cout << "Letter e = " << e << " times" << endl;

   cout << "Letter i = " << i << " times" << endl;

   cout << "Letter o = " << o << " times" << endl;

   cout << "Letter u = " << u << " times" << endl;

}

Hence the code and Output.

Please enter a string

Out of the 16 characters you entered.

Letter a = 2 times

Letter e = 1 times

Letter i = 0 times

Letter o = 1 times

Letter u = 0 times.