Thread: Need help For Assignment (Problem with Loop Control Structure)

I am new to java this is my programming Assignment , I will be grateful if anyone can show me or fixed my code that i placed below to produce the following output as shown here. We are only allowed to use control structures such as for loop, if else, if, do-while , while and switch statements for this program. We are not allowed to use methods.The problem i have with my code is that after the user enter its desired drinks and food from the food and drinks menu respectively, it return to the order menu but i want it to be able to return to the main menu when the user press the no '3' from the order menu, currently when the user press '3' the order menu just reappear!!

The following shows example output for this program that i want to achieved:
SJ Restaurant Ordering System
Main Menu
(1) Place Order
(2) Payment
(3) Quit
Enter your choice: 1

Order Menu
(1) Drinks
(2) Food
(3) Back to Main Menu
Enter your choice: 2

Food Menu
(1) Nasi Lemak RM5.00
(2) Roti Canai RM1.50
(3) Fried Noodle RM3.50
(4) Back to Order Menu
Enter order: 1
Enter quantity: 2

Food Menu
(1) Nasi Lemak RM5.00
(2) Roti Canai RM1.50
(3) Fried Noodle RM3.50
(4) Back to Order Menu
Enter order: 4

Order Menu
(1) Drinks
(2) Food
(3) Back to Main Menu
Enter your choice: 3

Main Menu
(1) Place Order
(2) Payment
(3) Quit
Enter your choice: 2
Order Quantity Unit Price Total
Nasi Lemak 2 5.00 10.00

Overall Total: 10.00

Payment: 50.00

Balance: 40.00

The current output of my code:
--------------------------------------------
SJ Restaurant Ordering System
--------------------------------------------
Main Menu
--------------
(1) Place Order
(2) Payment
(3) Quit
Enter your choice:1

Order Menu
------------
(1) Drinks
(2) Food
(3) Back to Main Menu)
Enter your choice:
1

Drinks Menu
--------------
(1)Milo + + RM5.00
(2) Coffee + RM1.50
(3) Tea+ RM3.50
(4) Back to Order Menu
Enter order:
1
Enter quantity:
2

Order Menu
------------
(1) Drinks
(2) Food
(3) Back to Main Menu)
Enter your choice:
2

Food Menu
--------------
(1)Burger + + RM5.00
(2) Pizza + RM1.50
(3) Nasilemak+ RM3.50
(4) Back to Order Menu
Enter order:
1
Enter quantity:
3

Order Menu
------------
(1) Drinks
(2) Food
(3) Back to Main Menu)
Enter your choice:
3

Order Menu
------------
(1) Drinks
(2) Food
(3) Back to Main Menu)
Enter your choice:

The problem as it can be seen here when the user press '3' it should return to the main menu but it does not

package assignment1;
 
import java.util.Scanner;
 
public class Assignment1Question2 {
 
public static void main(String[] args) 
 
{
 
  Scanner read = new Scanner(System.in);
 
    int  mainmenuchoice;
 
    int ordermenu;
 
    double quantity=0;
 
   double quantity2=0;
 
      int drinksorder=0;
 
       int foodorder=0;
 
       int order3=0;
 
    double subtotal=0;
 
    double subtotal2=0;
 
     double milo=5.50;
 
    double coffee=1.50;
 
   double tea=3.50;
 
  double burger=5.00;
 
   double pizza=1.50;
 
    doublenasilemak=3.50;
 
    double discount;
 
    double price;
 
     double discount2;
 
    double totalfinal;
 
     String output;
 
    String output2;
 
    double overalltotal;
 
     double total=0;
 
    double sum;
 
 double sum2;
 
   double total2=0;
 
 
      System.out.println("--------------------------------------------");
 
       System.out.println("SJ Restaurant Ordering System");
 
     System.out.println("--------------------------------------------");
 
      System.out.println("Main Menu");
 
      System.out.println("--------------");
 
     System.out.println("(1) Place Order");
 
      System.out.println("(2) Payment");
 
     System.out.println("(3) Quit");
 
     System.out.print("Enter your choice:");    
 
    choice=read.nextInt();
 
     while(mainmenuchoice!=3){
 
           if(mainmenuchoice==1)
 
          {
 
           System.out.println("Order Menu");
 
           System.out.println("------------");
 
          System.out.println("(1) Drinks");
 
            System.out.println("(2) Food");
 
           System.out.println("(3) Back to Main Menu)");
 
          System.out.println("Enter your choice:");
 
         ordermenu=read.nextInt();
 
            if(ordermenu==1)
 
       {
 
              System.out.println("Drinks Menu");
 
             System.out.println("--------------");
 
            System.out.println("(1)Milo + \t\t + RM5.00");
 
              System.out.println("(2) Coffee + \t\t RM1.50");
 
             System.out.println("(3) Tea+ \t\t RM3.50");
 
              System.out.println("(4) Back to Order Menu");
 
             System.out.println("Enter order:");
 
             drinksorder=read.nextInt();
 
            switch (drinksorder) {
 
              case 1:
             System.out.println("Enter quantity:");
             quantity=read.nextDouble();
             subtotal=milo;
             total=(subtotal * quantity);
             sum=total;
             output="milo" +1;  
             break;
 
             case 2:
             System.out.println("Enter quantity");
             quantity=read.nextDouble();
             subtotal=coffee;
             total=(subtotal * quantity);
             sum=total;
             output="coffee"+1;
             break;       
 
            case 3:
            System.out.println("Enter quantity");
            quantity=read.nextDouble();
            subtotal=tea;
            total=(subtotal * quantity);
            sum=total;
            output="tea" +1;
            return;
 
            default:
            break;
             }
 
          }else
              if(ordermenu==2)
 
         {
            System.out.println("Food Menu");
 
             System.out.println("--------------");
 
            System.out.println("(1)Burger + \t\t + RM5.00");
 
            System.out.println("(2) Pizza + \t\t RM1.50");
 
          System.out.println("(3) Nasilemak+ \t\t RM3.50");
 
        System.out.println("(4) Back to Order Menu");
 
           System.out.println("Enter order:");
 
           foodorder=read.nextInt();
 
             while(foodorder!=4){
 
                   if (foodorder==1){
 
                     System.out.println("Enter quantity:");
 
                     quantity2=read.nextDouble();
 
                      subtotal2=burger;
 
                      total2=(subtotal2*quantity2);
 
                     sum2=total2;
 
                     output2="burger"+1;
 
                       break;
 
                }else
 
                     if(foodorder2==2){
 
                      System.out.println("Enter quantity:");
 
                       quantity2=read.nextDouble();
 
                     subtotal2=pizza;
 
                     total2=(subtotal2*quantity2);
 
                     sum2=total2;
 
                    output2="pizza"+1;
 
                     break;
 
              }else
 
                       if(foodorder==3){
 
                       System.out.println("Enter quantity:");
 
                       quantity2=read.nextDouble();
 
                        subtotal2=nasilemak;
 
                      total2=(subtotal2*quantity2);
 
                      sum2=total2;
 
                      output2="nasilemak"+1;
 
                           break;
 
              }else 
 
                      if(foodorder==4){
 
                  System.out.println("Food Menu");
 
                 System.out.println("--------------");
 
                System.out.println("(1)Burger + \t\t + RM5.00");
 
               System.out.println("(2) Pizza + \t\t RM1.50");
 
              System.out.println("(3) Nasilemak+ \t\t RM3.50");
 
              System.out.println("(4) Back to Order Menu");
 
               System.out.println("Enter order:");
 
               order3=read.nextInt();
               break;
 
                 }else
                      if(foodorder!=0 || foodorder>4){
               System.out.println("please enter a valid choice!!!");
               break;
                 }         
               }  
 
                }else
 
                       if(mainmenuchoice==3){
                       System.out.println("Goodbye!!!");
 
                    } else
 
                       if (mainmenuchoice==2)
 
       { 
             System.out.println("Order \t\t Quantity\t\t Unit\t\t Price\t\t Total\t\t");
 
             System.out.println("-----------------------------------------------");
 
             System.out.println(drinksorder);
 
            System.out.println(quantity);
 
           System.out.println(subtotal);
 
           System.out.println(total);
 
             System.out.println(foodorder);
 
              System.out.println(quantity2);
 
               System.out.println(subtotal2);
 
               System.out.println(total2);
 
             overalltotal=total + total2;
 
             System.out.printf("Overall total is RM ",overalltotal);
 
            System.out.println(" Any Discount: ");
 
              discount=read.nextDouble();
 
            discount2=discount/100;
 
           price=overalltotal-(discount2*overalltotal);
 
           System.out.println("Payment: ");
 
            double payment=read.nextDouble();
 
            double balance = payment-price;
 
              System.out.println("Balance:" + balance);
 
           }
 
     }        
  }                         
}

Please edit your post and wrap your code with code tags:

[code]
**YOUR CODE GOES HERE**
[/code]

to get highlighting and preserve formatting.

What is the program's current output? Add some comments showing what needs to be changed.

--- Update ---

Also posted here: https://coderanch.com/t/684937/java/...ucture#3214673

output for this program that i want to achieve

Can you post the program's current output so we can see what the problem is?

--------------------------------------------
SJ Restaurant Ordering System
--------------------------------------------
Main Menu
--------------
(1) Place Order
(2) Payment
(3) Quit
Enter your choice:1

Order Menu
------------
(1) Drinks
(2) Food
(3) Back to Main Menu)
Enter your choice:
1

Drinks Menu
--------------
(1)Milo + + RM5.00
(2) Coffee + RM1.50
(3) Tea+ RM3.50
(4) Back to Order Menu
Enter order:
1
Enter quantity:
2

Order Menu
------------
(1) Drinks
(2) Food
(3) Back to Main Menu)
Enter your choice:
2

Food Menu
--------------
(1)Burger + + RM5.00
(2) Pizza + RM1.50
(3) Nasilemak+ RM3.50
(4) Back to Order Menu
Enter order:
1
Enter quantity:
3

Order Menu
------------
(1) Drinks
(2) Food
(3) Back to Main Menu)
Enter your choice:
3

Order Menu
------------
(1) Drinks
(2) Food
(3) Back to Main Menu)
Enter your choice:

The problem as it can be seen here when the user press '3' it should return to the main menu but it does not

--- Update ---

I will be really grateful if you can tell me what and where the loop control structure i can put in my code so that he main menu can reappear after my user enter the number "3" from the order menu to return from the main menu as i have try everything in the last 6 days and still i have not achieved my desired output.I have try to put a do while loop before the print statement of the SJ restaurant ordering system , but it does not work as it causes an error that the variable choice2 has not been initialize but the problem with that is i did not initialize the variable choice 2 should not be as I want the user to be able to enter their selection in the choice2 variable.

Is this the logic for your program:
main menu loop
show main menu
get option
option loop
... process option - exit option loop on user request
end option loop
end main menu loop


One problem I see in the code is improper formatting and indentations that make it hard to read and understand the logic.
Another problem is variable names. Variable names should describe what the variable contains.
The names choice and choice2 don't say what they are a choice of. One is for the main menu, the other is for??? I see 4 menus where choices can be made. For example foodMenuChoice would contain the user's choice from the Food Menu

how do i allow my user to exit the order menu to the main menu

That is very hard to say with the way the program is currently coded.
The code needs to be changed as I suggested so the program's current logic can be understand.
Proper formatting and variable names will make the code easier to understand.

For example finding where the variable that controls the Order menu loop is used so the end of the Order Menu logic can be seen.
The variables: choice, choice2, order1, etc carry no meaning when they are read.

suggestion on how i can achieved the desired output.

Fix the formatting and variable names so the logic can be read and understood.

A suggestion: Remove all the menus except for the Main and Order menu. Get that code to work
and then add in the Food Menu, get that to work,
then add in the Drink menu, etc

variable mainmenuchoice has to be initialized

Give it a value outside of the loop when it is defined. Inside the loop the user's response will change its value.

Note: The code's formatting and indentation needs work to make the code readable. The statements need to be properly indented to show the program's logic.
The extra blank lines between the statements need to be removed.

meaning of the error orphaned case?

I imagine it means the case is not in a switch.

Note: The code has improved, but the indentations are not deep enough(often only 1 space instead of at least 3) to see the logic clearly.
For example:

                  switch(ordermenuchoice)
                    {
                      case 1:
                     do{

It should be:

                  switch(ordermenuchoice)
                   {
                       case 1:
                          do{

Another technique that will help you organize the code and find problems is to add comments on the ends of do{}while statements and the switch statements to make it easier to pair the end with the beginning of the statement.

   do{  // start processing food menu
    ...
   }while(...); // end processing food menu
 
...
  switch(someVar) 
  {
...
   } // end switch(someVar)