Stuck with Switch

[hhhhhhhh]

I am a new member.
I got stuck using Switch in java. Could someone help me?

This is my code:
Thanks

import java.util.Scanner;
 
public class MailOrder { 
 
    public static void main(String[] args) {
 
      Scanner input = new Scanner( System.in );//declare Scanner object
 
      int productID=0;//productID
      double totalValue = 0; //total value of the order
      double Product1 = 2.98;
      double Product2 = 4.50;
      double Product3 = 6.87;
 
      System.out.println("Enter product number (1-3): " );
      productID = input.nextInt(); //read the product ID
 
      // determine the number sold of the item
      System.out.println( "Enter quantity ordered: " );
      int quantity = input.nextInt();
 
      //please complete the switch statement
      switch (productID)
      {
          case 1:                     
             quantity += quantity;
             break;
 
          case 2:                       
             quantity += quantity;
             break;
 
          case 3:                     
             quantity += quantity;
             break;
 
         } // end switch
 
         if (totalValue !=0)
             System.out.println ("Total Valude of this order is "+ totalValue);
        }
 
}

[Ganon11]

What are you having trouble with?

[hhhhhhhh]

Thanks for quick reply.

I do not know how to set up the formula. When I run the file, it looks like this:

init:
deps-jar:
compile-single:
run-single:
Enter product number (1-3):


When I enter information, it becomes this:


init:
deps-jar:
compile-single:
run-single:
Enter product number (1-3):
1
Enter quantity ordered:
3
BUILD SUCCESSFUL (total time: 6 minutes 31 seconds)


Can you help how to figure out?
Many thanks.

[madhoriya22]

Thanks for quick reply.

I do not know how to set up the formula. When I run the file, it looks like this:

init:
deps-jar:
compile-single:
run-single:
Enter product number (1-3):


When I enter information, it becomes this:


init:
deps-jar:
compile-single:
run-single:
Enter product number (1-3):
1
Enter quantity ordered:
3
BUILD SUCCESSFUL (total time: 6 minutes 31 seconds)


Can you help how to figure out?
Many thanks.

Hi,
Can tell us what are you trying to do with ur program ? And how come during compilation it is asking for input?
Always use code tags instead of making the text bold.

[r035198x]

Thanks for quick reply.

I do not know how to set up the formula. When I run the file, it looks like this:

init:
deps-jar:
compile-single:
run-single:
Enter product number (1-3):


When I enter information, it becomes this:


init:
deps-jar:
compile-single:
run-single:
Enter product number (1-3):
1
Enter quantity ordered:
3
BUILD SUCCESSFUL (total time: 6 minutes 31 seconds)


Can you help how to figure out?
Many thanks.

The program does exactly what you told it to do.
What was your expected output?

[JosAH]

When I take a "bird's eye" view on that code I see:

int totalValue= 0;
 
// a whole lot of things that all have nothing to do with
// 'totalValue', i.e. it isn't changed at all by any of those
// complicated statements and finally we reach:
 
if (totalValue != 0) // sure, right
   ...
 

kind regards,

Jos

[hhhhhhhh]

I do not know how to set a formula.

I want to buy, for example 2* Product1 + 5*Product2 + 3*Product3 and the print will show the total amount of all products.

[hhhhhhhh]

I am a new member.
I got stuck using Switch in java. Could someone help me?

This is my code:
Thanks

import java.util.Scanner;
 
public class MailOrder { 
 
    public static void main(String[] args) {
 
      Scanner input = new Scanner( System.in );//declare Scanner object
 
      int productID=0;//productID
      double totalValue = 0; //total value of the order
      double Product1 = 2.98;
      double Product2 = 4.50;
      double Product3 = 6.87;
 
      System.out.println("Enter product number (1-3): " );
      productID = input.nextInt(); //read the product ID
 
      // determine the number sold of the item
      System.out.println( "Enter quantity ordered: " );
      int quantity = input.nextInt();
 
      //please complete the switch statement
      switch (productID)
      {
          case 1:                     
             quantity += quantity;
             break;
 
          case 2:                       
             quantity += quantity;
             break;
 
          case 3:                     
             quantity += quantity;
             break;
 
         } // end switch
 
         if (totalValue !=0)
             System.out.println ("Total Valude of this order is "+ totalValue);
        }
 
}

I made it work. I changed line #26, 30, and 34.
However, I can enter only one product at a time. For example, the message asks: Enter product number (1-3), I can enter only 1 or 2 or 3.

How do I set up to NOT enter 4 or to enter 1 and 2 and 3 a tthe same time?


When I run the file, I got a message Enter product number (1-3). I entered 1 in the input box. However, the output looks like this:

Enter product number (1-3):
1

How do I move # 1 after the colon? For example: Enter product number (1-3): 1

[r035198x]

I made it work. I changed line #26, 30, and 34.
However, I can enter only one product at a time. For example, the message asks: Enter product number (1-3), I can enter only 1 or 2 or 3.

How do I set up to NOT enter 4 or to enter 1 and 2 and 3 a tthe same time?


When I run the file, I got a message Enter product number (1-3). I entered 1 in the input box. However, the output looks like this:

Enter product number (1-3):
1

How do I move # 1 after the colon? For example: Enter product number (1-3): 1

Just use an if else to make sure that the number supplied is either 1,2 or 3.

[Ganon11]

For your output message question, you are using System.out.println(). The println stands for print line, so it always moves to a new line once it is finished outputting the String inside. You should use System.out.print() instead. It does exactly the same stuff as println, but doesn't print a newline character at the end. This will result in your desired output.

[hhhhhhhh]

For your output message question, you are using System.out.println(). The println stands for print line, so it always moves to a new line once it is finished outputting the String inside. You should use System.out.print() instead. It does exactly the same stuff as println, but doesn't print a newline character at the end. This will result in your desired output.

Thanks for your idea. I tried but still did not work as I expected.
Here is the code

System.out.println("\nEnter product number (1-3):");
productID = input.nextInt(); //read the product ID

// determine the number sold of the item
System.out.println( "Enter quantity ordered:" );
int quantity = input.nextInt();


And here is the output:

Enter product number (1-3):
2
Enter quantity ordered:
2
Total Valude of this order is $9.0

[Ganon11]

Thanks for your idea. I tried but still did not work as I expected.
Here is the code

System.out.println("\nEnter product number (1-3):");   
      productID = input.nextInt(); //read the product ID
 
      // determine the number sold of the item
      System.out.println( "Enter quantity ordered:" );
      int quantity = input.nextInt();

OK, you're still using System.out.println().

Change this to System.out.print();