Function to check vowel.

Function to check vowel.

int check_vowel(char a)

{

    if (a >= 'A' && a <= 'Z')

       a = a + 'a' - 'A';   /* Converting to lower case or use a = a + 32 */

    if (a == 'a' || a == 'e' || a == 'i' || a == 'o' || a == 'u')

       return 1;

    return 0;

}