C program to check whether input alphabet is a vowel or not using switch

#include <stdio.h>
 
int main()
{
  char ch;
 
  printf("Input a character : ");
  scanf("%c", &ch);
 
  switch(ch)
  {
    case 'a':
    case 'A':
    case 'e':
    case 'E':
    case 'i':
    case 'I':
    case 'o':
    case 'O':
    case 'u':
    case 'U':
      printf("%c is a vowel.\n", ch);
      break;
    default:
      printf("%c is not a vowel.\n", ch);
  }              
 
  return 0;
}

/*

Output : #1

Input a character : A
A is a vowel. 
Input a character : x
x is not a vowel.
*/