Convert Vowels into Upper Case in C++

Here is a program is given to us by my friend Tom. This program asks the user to give a string and then the program will convert all the vowels into upper case format in the given string.

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Sample Program Output

Program Listing

#define _CRT_SECURE_NO_WARNINGS

#include <iostream>

#include <string>

#include <cctype>

using namespace std;

bool is_vowel(char ch)

{

   const string vowels("aeiouAEIOU");

   return vowels.find(ch) != string::npos;

}

string& vowels_to_upper(string& s)

{

   for (char &ch : s)

     if (is_vowel(ch) && islower(ch))

       ch = toupper(ch);

   return s;

}

int main()

{

   string input;

   cout <<"\n\n";

   cout << "\tConvert Vowels into Upper Case in C++";

   cout <<"\n\n";

   while (true)

   {

     cout << "\tEnter a string (or quit): ";

     getline(cin, input);

     if (input == "quit")

       break;

     cout <<"\t" <<vowels_to_upper(input) << '\n';

    cout <<"\n";

   }

   cout <<"\n";

   cout <<"\tEnd of Program";

   cout <<"\n";

}