C program to count number of vowels in a string

#include<stdio.h>
#include<conio.h>
#include<string.h>
void main()
{
 char sk[10];
int count=0,i;
clrscr();
printf("Enter a String :");
gets(sk);
for(i=0;i<strlen(sk);i++)
switch(sk[i])
{
 case 'A':
 case 'E':
 case 'I':
 case 'O':
 case 'U':
 case 'a':
 case 'e':
 case 'i':
 case 'o':
 case 'u': count++;
 break;
}
printf("Vowels are present in the string : %d", count);
getch();
}

Output: