Remove Vowels and Consonants in Modern C++

 A simple program that I wrote to ask the user to give a string and then the program will remove the vowels and consonants in Modern C++.

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Program Listing

#include <iostream>

#include <string>

bool is_consonant(char ch) noexcept

{

  const std::string consonants("bcdfghjklmnpqrstvwxyzBCDFGHJKLMNPQRSTVWXYZ");

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

}

bool is_vowel(char ch) noexcept

{

  const std::string vowels("aeiouAEIOU");

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

}

std::string remove_vowels(const std::string& input) noexcept

{

std::string output;

output.reserve(input.size());

for (char ch : input)

  if (!is_vowel(ch))

    output += ch;

return output;

}

std::string remove_consonants(std::string& input) noexcept

{

   std::string output;

   output.reserve(input.size());

   for (char ch : input)

  if (!is_consonant(ch))

       output += ch;

   return output;

}

int main()

{

   std::string input;

   std::cout <<"\n\n";

   std::cout << "\tRemove Vowels and Consonants in Modern C++";

   std::cout <<"\n\n";

   std::cout << "Enter a string: ";

   std::getline(std::cin, input);

   std::cout <<"\n\n";

   std::cout << "String Without Consonants: " << remove_consonants(input) << "\n\n";

   std::cout << "String Without Vowels    : " << remove_vowels(input) << "\n";

   std::cout <<"\n\n";

   std::cout <<"\tEnd of Program";

   std::cout <<"\n\n";

}