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";
}

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