• Write a program that takes in a sentence from the user and then counts the number of vowels in the sentence.
• You will need to use string.length(), string indexing using the square bracket syntax, and a for loop to correctly solve this problem.
• Open up a new C++ program named vowels.cpp
• First, welcome the user to the program and explain its purpose:

The output of your program should look identical to the sample output below.

Assignment 16.2: Vowels Again

• Write a function with the following signature:

  int countVowels(string str) 

• The function returns a count of the letters in the string parameter that are vowels (A, E, I, O, U, a, e, i, o, u)
  

• Hint: You've done this same thing on your previous assignment, just not with a function.
• For this assignment we are going to "outsource" the work of counting vowels to a function named countVowels.
  

Part 1:

• Copy and paste the starter code into a file named vowels.cpp:

/**
* Name
* Section
*/

int countVowels(string s)
{
    //add the code for your function here

}

int main()
{
    string sentence;
    int numVowels;
    //Prompt user to enter a sentence
   
    //call the countVowels function, passing it the sentence as a parameter
    //& storing result as numVowels
   
    //print out the number of vowels in the sentence

    cout << "There are " << numVowels << " in your sentence." << endl;

}

• Your program should first prompt the user to enter a sentence.
• Hint: Use getline().
• Then, you should pass the sentence variable into your function and store the return value in your numVowels variable.
• Test out your code with various sentences.
  
• The program should now work like this:

Enter a sentence: I love cookies a lot!

There are 9 vowels in your sentence.

Part 2:

• Add a while loop to your code to repeatedly prompt the user to enter a sentence or q to quit.
  
• The program should accept q, Q, quit, or Quit as signals to exit the loop.
• When you are finished, your program should work like this:

Enter a sentence or q to quit: I love cookies a lot!

There are 9 vowels in your sentence.

Enter a sentence or q to quit: I wouldn't mind a piece of cake, either.

There are 14 vowels in your sentence.

Enter a sentence or q to quit: Q

Goodbye!

Part 3:

• Next, add another function to your program to count letters in the sentence.
• Your function signature should look like this:

int countLetters(string s)

• Thus, add a new variable to the top of main that will store the result of calling the above function.

• To write the above function, you may need to consult the ASCII table. Hint: what is the range of ASCII values in which you would find letters?

• After you write the above function, call it inside of main and then add to your print statement to display the result for the number of letters in the sentence.
• Your program should now work like this: