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

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Program Listing

/* consonants_vowels.c
   Author : Jake Rodriguez Pomperada, MAED-IT, MIT
   www.jakerpomperada.blogspot.com and www.jakerpomperada.com
   jakerpomperada@gmail.com
   Bacolod City, Negros Occidental Philippines
*/

#include <stdio.h>
#include <string.h>
#include <stdbool.h>

bool is_consonant(char ch)
{
  const char consonants[] = "bcdfghjklmnpqrstvwxyzBCDFGHJKLMNPQRSTVWXYZ";

  return strchr(consonants, ch) != NULL;
}

bool is_vowel(char ch)
{
  const char vowels[] = "aeiouAEIOU";

  return strchr(vowels, ch);
}

char* remove_vowels(const char input[], char output[], size_t size)
{
	int j = 0;
	for(size_t i = 0; i < size; ++i)
		if (!is_vowel(input[i]))
		{
			output[j++] = input[i];
		}
	output[j] = '\0';

	return output;
}

char* remove_consonants(const char input[], char output[], size_t size)
{
	int j = 0;
	for(size_t i = 0; i < size; ++i)
		if (!is_consonant(input[i])) {
			output[j++] = input[i];
		}
	output[j] = '\0';

	return output;
}

int main()
{
   char input[100] = "";
   char output[100] = "";

   printf("\n\n");
   printf("\tRemove Consonants and Vowels in C");
   printf("\n\n");
   printf("\tEnter a string: ");
   scanf("%99[^\n]s", input);

   printf("\n\n");
   printf("\tString Without Consonants: %s\n",remove_consonants(input, output, 100));
   printf("\n");
   printf("\tString Without Vowels    : %s\n",remove_vowels(input, output, 100));
   printf("\n\n");
   printf("\tEnd of Program");
   printf("\n\n");

}

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