menghitung huruf vokal menggunakan c++ ( Array )

#include <stdio.h>
#include <conio.h>
#include <string.h>
void main()
{
char kalimat[99];
int x=0,vokal=0,y;
clrscr();
printf("= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =\n\n");
printf("*******'' P R O G R A M   P E N G H I T U N G    H U R U F   V O K A L ''*******\n\n");
printf("= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =\n\n");
printf("SILAHKAN MASUKAN KATA / KALIMAT : ");gets(kalimat);//tidak bisa huruf kapital
y=strlen(kalimat);
for(x=0;x<y;x++)
{if(kalimat[x]=='a'||kalimat[x]=='i'||kalimat[x]=='u'||kalimat[x]=='e'||kalimat[x]=='o')
vokal++;}
printf("\nJUMLAH HURUF VOKAL : %d huruf",vokal);//Tidak bisa huruf kapital
getch();
}

contoh hasil,,,,

gimana???, mantap kan,,,,,