Vowel Search (user input)

package javaapplication328;
import java.util.*;
/**
 *
 * @author Medina
 */
public class JavaApplication328 {
//
    //
    public static void main(String[] args) {
        Scanner scan = new Scanner (System.in);
        System.out.print("Input character string: ");
        String str = scan.next();
        str=str.toLowerCase();
        char c = ' ';
        int vowel = 0;
        for(int i=0;i<str.length();i++)
        {c=str.charAt(i);
        if (c=='a'||c=='e'||c=='i'||c=='o'||c=='u'){vowel++;}
        }
        System.out.print("There are: "+vowel+" vowel/s");
    }

}