Sentinel-controlled loop

Hi how can i use a sentinel controlled loop to keep prompting the user to enter the next character after it computes whether the char is a digit or a vowel till the user inputs a sentinel character '#' it will exit the program.

import java.util.Scanner;
class test1 {

public static void main(String[] args) {
Scanner zz= new Scanner(System.in);
System.out.println("Enter a character:");
String s = zz.next();
char input = s.charAt(0);


if (input=='a'||input=='e'||input=='i'||input=='o'||input=='u') {
System.out.println("Vowel");
}
else if(Character.isDigit(input))
{
System.out.println("Digit");
}

}
}

you asked this??

Code:

---

import java.util.Scanner;

class test1 {

public static void main(String[] args) {
Scanner zz= new Scanner(System.in);
System.out.println("Enter a STRING:");
String s = zz.next();
//char input = s.charAt(0);

for(int k=0;k<=s.length()-1;k++)
{
if (s.charAt(k)=='a'||s.charAt(k)=='e'||s.charAt(k)=='i'||s.charAt(k)=='o'||s.charAt(k)=='u') {
System.out.println("Vowel");
}
else if(Character.isDigit(s.charAt(k)))
{
System.out.println("Digit");
}
}
}
}

---

output:

Code:

---

Enter a STRING:
1necmi6
Digit
Vowel
Vowel
Digit

---

Nope what i meant was to use a while loop then prompt for user to input character and compute whether the char is a digit or vowel. If user enter # then it will will break the loop.

So basically output will be:

Enter Character:
A
Vowel

Enter Character:
3
Digit

Enter Character:
E
Vowel

....
....
....
....
....
....

Enter Character:
#
// It will exit the program

according to me you can do this with do-while loop..

im not sure i tried doing like this.. but it keeps looping forever.. please help

import java.util.Scanner;
class test1 {

public static void main(String[] args) {
Scanner zz= new Scanner(System.in);
System.out.println("Enter a character:");
String s = zz.next();
char input = s.charAt(0);

do{

if (input=='a'||input=='e'||input=='i'||input=='o'||input=='u') {
System.out.println("Vowel");
}
else if(Character.isDigit(input))
{
System.out.println("Digit");
}
}
System.out.println("Enter a Character again:");
while(input !='#');

}
}

Code:

---


import java.util.Scanner;
class test1 {

public static void main(String[] args) {
Scanner zz= new Scanner(System.in);
System.out.println("Enter a character:");
String s = zz.next();
char input = s.charAt(0);

do{
    if (input=='a'||input=='e'||input=='i'||input=='o'||input=='u')
        System.out.println("Vowel");

    else if(Character.isDigit(input))
        System.out.println("Digit");

    else if(input=='#') 
            break;
   
    System.out.println("\nEnter a character:");
    s = zz.next();
    input = s.charAt(0);            //new value for input
  }while(input !='#');
 
  System.out.println("\n******");
}
}

---

while writing your codes use

[code][code] tags..

Quote:

---

Originally Posted by hugo84

im not sure i tried doing like this.. but it keeps looping forever.. please help

import java.util.Scanner;
class test1 {

public static void main(String[] args) {
Scanner zz= new Scanner(System.in);
System.out.println("Enter a character:");
String s = zz.next();
char input = s.charAt(0);

do{

if (input=='a'||input=='e'||input=='i'||input=='o'||input=='u') {
System.out.println("Vowel");
}
else if(Character.isDigit(input))
{
System.out.println("Digit");
}
}
System.out.println("Enter a Character again:");
while(input !='#');

}
}

---

because you didn't give new value for "input"...always it controls input's first value and loops forever..

Very much thanks to your help holstary. appreciate it dude. I will take note of the code posting tags very sorry about it.

u can write this instead of do-while..

Code:

---

while(input !='#')
{
    if (input=='a'||input=='e'||input=='i'||input=='o'||input=='u')
        System.out.println("Vowel");

    else if(Character.isDigit(input))
        System.out.println("Digit");

    else if(input=='#')
            break;
   
    System.out.println("\nEnter a character:");
    s = zz.next();
    input = s.charAt(0);    //new value for input
  }

---

Quote:

---

Originally Posted by holestary

u can write this instead of do-while..

Code:

---

...    else if(input=='#')
            break;

---

---

What is the point of that 'else if...' ?

Good teaching is more a giving of the right questions than a giving of the right answers...
J. Albers

Quote:

---

Originally Posted by dlorde

What is the point of that 'else if...' ?

Code:

---

...    else if(input=='#')
            break;

---

Good teaching is more a giving of the right questions than a giving of the right answers...
J. Albers

---

i've missed out this code..it is unnecessary while using while loop in this prog..
i know u can do this program better than me, short, etc..:)
thanks..

Thanks for the inputs.. Appreciate it