Need help with Loops

[airfrog19]

For a project, i have to create a program that can order food and add up all the totals. I am stuck on how to create a loop when the user needs to order the food. This is what i got so far:

 

 

package project.pkg1;

import java.util.Scanner;

 

public class Project1 {

 

 

    public static void main(String[] args) {

     int choice = 0;

     String order;

     Scanner Keyboard = new Scanner(System.in);

     

     

     double num;

     double GoodBurger = 7.75;

     double GoodSalad = 7.00;

     double Soda = 2.00;

     double KidsMeal = 3.00;

     double tax;

     double subtotal = 0, total;

     final double salestax = 0.875;

     

     

     System.out.println("Welcome to Good Burger!");

     System.out.println("=======================");

     System.out.println("Place your orders and type 'Finish' when you are done");

     System.out.println("--------------------------------------------------------");

    

    

     System.out.println("1. GoodBurger $7.75");

     System.out.println("2. GoodSalad $ 7.00");

     System.out.println("3. Soda $2.00");

     System.out.println("4. KidsMeal $3.00 \n");

     choice = Keyboard.nextInt();

 

     

     

    

     

       

    

}

 

What do i need to do? 

[Archangel1994]

Add a boolean for "doneOrdering" and put the item selection in a while loop.

 

While(doneOrdering == false) (Can also do "While(!doneOrdering))

{

 

}

 

When finished is entered set the boolean to true so you can continue to something else.

[79wjd]

boolean done = false; 

 

while (!done){

    Take order. 

    set done = true upon completion of the order.

}

[airfrog19]

Add a boolean for "doneOrdering" and put the item selection in a while loop.

 

While(doneOrdering == false) (Can also do "While(!doneOrdering))

{

 

}

 

When finished is entered set the boolean to true so you can continue to something else.

So, will it print out the list of food that the user will write until it says done?

[Archangel1994]

So, will it print out the list of food that the user will write until it says done?

It will print out the list of food and accept inputs until finished is triggered.

[airfrog19]

It will print out the list of food and accept inputs until finished is triggered.

do i put the list of food in inside the while loop? like how would it look like?

[Archangel1994]

do i put the list of food in inside the while loop? like how would it look like?

Does Java have a pre-defined update function that is called 60 times per second?

[airfrog19]

Does Java have a pre-defined update function that is called 60 times per second?

where do i find that?

[airfrog19]

boolean done = false; 

 

while (!done){

    Take order. 

    set done = true upon completion of the order.

}

where do i write that?

[Satlen]

Not going to code if for you but should look something like this:

package project.pkg1;import java.util.Scanner; public class Project1 {    public static void main(String[] args) {     	 	 	 int choice = 0;     String order;     Scanner Keyboard = new Scanner(System.in);          double num;     double GoodBurger = 7.75;     double GoodSalad = 7.00;     double Soda = 2.00;     double KidsMeal = 3.00;     double tax;     double subtotal = 0, total;     final double salestax = 0.875;          System.out.println("Welcome to Good Burger!");     System.out.println("=======================");     System.out.println("Place your orders and type 'Finish' when you are done");     System.out.println("--------------------------------------------------------");    	 //WHILE(BOOL IS TRUE)	     System.out.println("1. GoodBurger $7.75");     System.out.println("2. GoodSalad $ 7.00");     System.out.println("3. Soda $2.00");     System.out.println("4. KidsMeal $3.00 \n");     choice = Keyboard.nextInt();	 	 //ADD THE CHOICE PRICE TO A VARIABLE THAT CONTAINS TOTAL	 	 //ASK USER IF THEY WANT TO ADD MORE. USE IF STATMENT TO DETERMINE.	 //IF USER WANTS TO STOP, SET BOOL TO FALSE	 } 

[79wjd]

package project.pkg1;

import java.util.Scanner;

 

public class Project1 {

 

 

    public static void main(String[] args) {

     int choice = 0;

     String order;

     Scanner Keyboard = new Scanner(System.in);

     

     

     double num;

     double GoodBurger = 7.75;

     double GoodSalad = 7.00;

     double Soda = 2.00;

     double KidsMeal = 3.00;

     double tax;

     double subtotal = 0, total;

     final double salestax = 0.875;

     

   System.out.println("Welcome to Good Burger!");

    System.out.println("=======================");

    System.out.println("Place your orders and type 'Finish' when you are done");

    System.out.println("--------------------------------------------------------");

 

   

    while(!done){ 

         choice = Keyboard.nextInt(); //user enters the order and then finish. 

          if (choice == 1) {

                      System.out.println("1. GoodBurger $7.75");

                       subTotal += GoodBurger;

          }

          else if (choice == 2) .............and so on. 

          else if (choice == 5) done = true; //Because you're using .nextInt() you're reading ints, not strings, so I                                                                               don't think "finish" will be read (I may be wrong though...not sure)

     }

}

 

[airfrog19]

 

package project.pkg1;

import java.util.Scanner;

 

public class Project1 {

 

 

    public static void main(String[] args) {

     int choice = 0;

     String order;

     Scanner Keyboard = new Scanner(System.in);

     

     

     double num;

     double GoodBurger = 7.75;

     double GoodSalad = 7.00;

     double Soda = 2.00;

     double KidsMeal = 3.00;

     double tax;

     double subtotal = 0, total;

     final double salestax = 0.875;

     

   System.out.println("Welcome to Good Burger!");

    System.out.println("=======================");

    System.out.println("Place your orders and type 'Finish' when you are done");

    System.out.println("--------------------------------------------------------");

 

   

    while(!done){ 

         choice = Keyboard.nextInt(); //user enters the order and then finish. 

          if (choice == 1) {

                      System.out.println("1. GoodBurger $7.75");

                       subTotal += GoodBurger;

          }

          else if (choice == 2) .............and so on. 

          else if (choice == 5) done = true; //Because you're using .nextInt() you're reading ints, not strings, so I                                                                               don't think "finish" will be read (I may be wrong though...not sure)

     }

}

 

 

what if i wanted to use words instead of numbers? can i replace 1 with something else?

[79wjd]

what if i wanted to use words instead of numbers? can i replace 1 with something else?

You could use TextIO.getln(); which just reads a line from input. And make the user input the name of the item being ordered. So, if he wanted to order a goodburger and a goodsalad, he would type goodburger then hit enter, the program would recognize the input and add goodburger to the order, and then he would type goodsalad and hit enter.

 

Something like this:

       while(!done){          choice = TextIO.getln(); //user enters the order and then finish.           if (choice.toUpperCase.equals("GOODBURGER")) { //.toUpperCase capitlizes the entire string --                                                                               //alleviate user input errors.                      System.out.println("1. GoodBurger $7.75");                      subTotal += GoodBurger;          }          else if (choice.toUpperCase.equals("GOODSALAD")) .............and so on.           else if (choice.toUpperCase.equals("FINISH")) done = true;          else                System.out.println("I'm sorry, I do not recognize that);     }}

[79wjd]

-double post - ignore

[airfrog19]

You could use TextIO.getln(); which just reads a line from input. And make the user input the name of the item being ordered. So, if he wanted to order a goodburger and a goodsalad, he would type goodburger then hit enter, the program would recognize the input and add goodburger to the order, and then he would type goodsalad and hit enter.

 

Something like this:

       while(!done){          choice = TextIO.getln(); //user enters the order and then finish.           if (choice.toUpperCase.equals("GOODBURGER")) { //.toUpperCase capitlizes the entire string --                                                                               //alleviate user input errors.                      System.out.println("1. GoodBurger $7.75");                      subTotal += GoodBurger;          }          else if (choice.toUpperCase.equals("GOODSALAD")) .............and so on.           else if (choice.toUpperCase.equals("FINISH")) done = true;     }}

so i did what you said but it's not working http://puu.sh/cqv6f/858f4c2fce.png  do i need another scanner or string?

[airfrog19]

 

Not going to code if for you but should look something like this:

package project.pkg1;import java.util.Scanner; public class Project1 {    public static void main(String[] args) {     	 	 	 int choice = 0;     String order;     Scanner Keyboard = new Scanner(System.in);          double num;     double GoodBurger = 7.75;     double GoodSalad = 7.00;     double Soda = 2.00;     double KidsMeal = 3.00;     double tax;     double subtotal = 0, total;     final double salestax = 0.875;          System.out.println("Welcome to Good Burger!");     System.out.println("=======================");     System.out.println("Place your orders and type 'Finish' when you are done");     System.out.println("--------------------------------------------------------");    	 //WHILE(BOOL IS TRUE)	     System.out.println("1. GoodBurger $7.75");     System.out.println("2. GoodSalad $ 7.00");     System.out.println("3. Soda $2.00");     System.out.println("4. KidsMeal $3.00 \n");     choice = Keyboard.nextInt();	 	 //ADD THE CHOICE PRICE TO A VARIABLE THAT CONTAINS TOTAL	 	 //ASK USER IF THEY WANT TO ADD MORE. USE IF STATMENT TO DETERMINE.	 //IF USER WANTS TO STOP, SET BOOL TO FALSE	 } 

what do i write when the boolean is true? the orders?

[SheepDropper]

What IDE are you using to code? Usually if you hover over the red line it will display some suggestions.

 

If you wanna read in a String you can use Scanner.nextLine();

 

I would not recommend this though as it means validating the option would be more difficult than asking the users to make a selection from an int or a char.

 

 

As for the while loop bit based on your last post, while the condition is true keep prompting the user to make a selection, read the selection and add the order according to how you were doing it. If the user is done, set the boolean to false and handle it accordingly.