Character is Vowel or not

#include <stdio.h> 

 main() 

  {
      char ch;
      printf("Enter a character\n");
      scanf("%c", &ch);
      if (ch == \'a\' || ch == \'A\' || ch == \'e\' || ch == \'E\' || ch == \'i\' || ch == \'I\' || ch ==\'o\' || ch==\'O\' || ch == \'u\' || ch == \'U\')
          printf("%c is a vowel.\n", ch);
      else
          printf("%c is not a vowel.\n", ch);
      return 0;
  }