Write a C Program to count total number of vowel of a string

/*---------------------------------------------------------------------------
    PROGRAM TO COUNT THE NUMBER OF VOWELS IN A GIVEN STRING
        Program by http://electrofriends.com
   Copyrights (c) 2005-2007 electrofriends.com, All rights reserved.
---------------------------------------------------------------------------*/
#include<stdio.h>
#include<conio.h>
void main()
{
    char str[50];
    int vowels = 0, i = 0;
    clrscr();
    printf("\n--------------------------------------------------------");
    printf("\n\nPROGRAM TO COUNT THE NUMBER OF VOWELS IN A GIVEN STRING");
    printf("\n\n--------------------------------------------------------");
    printf("\n\n\t ENTER A STRING...: ");
    gets(str);
    while(str[i] != '\0')
    {
        if(str[i]=='A'||str[i]=='a'||str[i]=='E'||str[i]=='e'||
           str[i]=='I'||str[i]=='i'||str[i]=='O'||str[i]=='o'||
           str[i]=='U'||str[i]=='u')
            vowels++;
        i++;
    }
    printf("\n\n\t THE TOTAL NUMBER OF VOWELS IS...: %d", vowels);
    printf("\n\n-------------------------------------------------------");
    getch();
}