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Remove vowels from a string in C

C program to remove or delete vowels from a string. If the input is "C programming," then the output is "C prgrmmng."

In the program, we create a new string and process input string character by character. If a vowel is present, we exclude it otherwise we copy it. After the input ends, we copy the new string into it. Finally, we obtain a sequence of characters without vowels.

C program to remove vowels from a string

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

int check_vowel(char);

int main()
{
  char s[100], t[100];
  int c, d = 0;

  printf("Enter a string to delete vowels\n");
  gets(s);

  for (c = 0; s[c] != '\0'; c++) {
    if (check_vowel(s[c]) == 0) {     // If not a vowel
      t[d] = s[c];
      d++;
   }
  }

  t[d] = '\0';

  strcpy(s, t);  // We are changing initial string. This is optional.

  printf("String after deleting vowels: %s\n", s);

  return 0;
}

int check_vowel(char t)
{
  if (t == 'a' || t == 'A' || t == 'e' || t == 'E' || t == 'i' || t == 'I' || t =='o' || t=='O' || t == 'u' || t == 'U')
    return 1;

  return 0;
}

Output of program:
C program to delete vowels from a string output

C programming code using pointers

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
 
int check_vowel(char);
 
main()
{
   char string[100], *temp, *p, ch, *start;
 
   printf("Enter a string\n");
   gets(string);
 
   temp = string;
   p = (char*)malloc(100);
 
  if( p == NULL )
   {
      printf("Unable to allocate memory.\n");
      exit(EXIT_FAILURE);
   }

   start = p;
 
   while(*temp)
   {
      ch = *temp;
 
      if ( !check_vowel(ch) )
      {
         *p = ch;
         p++;
      }
      temp++;
   }
   *p = '\0';
 
   p = start;
   strcpy(string, pointer); /* If you wish to convert original string */
   free(p);
 
   printf("String after removing vowel(s): \"%s\"\n", string);
 
   return 0;
}
 
int check_vowel(char a)
{
  if (a == 'a' || a == 'e' || a == 'i' || a == 'o' || a == 'u')
    return 1;
  else if (a == 'A' || a == 'E' || a == 'I' || a == 'O' || a == 'U')
    return 1;
  else
    return 0;
}