C Program to count the number of vowels in a given string using switch statement.

#include  <conio.h>
#include  <stdio.h>
#include  <ctype.h>

void main()
{
    char  str[50], c ;
    int  i, v=0 ;
    clrscr() ;
    printf("Enter a string: ") ;
    gets(str) ;
    for(i=0 ; str[i]!='\0' ; i++)
        {
            c=tolower(str[i]) ;
            switch(c)
                {
                case 'a':
                case 'e':
                case 'i':
                case 'o':
                case 'u':
                    v++ ;
                    break;
                default:
                    break;
                }
        }
    printf("Number of vowels in %s is %d", str, v) ;
    getch() ;
}