Problem with do-while ! !

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I have problem ,How can do this code?

----------------------------------------------------
### Welcome to Uber Fare Calculator ###
----------------------------------------------------
| 1 : Get fare information about available rides |
| 2 : Get a Fare Estimate for your Journey |
| 3 : Submit Rating of your Ride |
| 4 : Exit and display summary |
----------------------------------------------------
> Please enter your choice... (1-4):5

Invalid Choice!! Please Try again

----------------------------------------------------
### Welcome to Uber Fare Calculator ###
----------------------------------------------------
| 1 : Get fare information about available rides |
| 2 : Get a Fare Estimate for your Journey |
| 3 : Submit Rating of your Ride |
| 4 : Exit and display summary |
----------------------------------------------------
> Please enter your choice... (1-4):1

-------------------------------------
*** RIDES ***
-------------------------------------
| X or x : UberX |
| L or l : UberXL |
| B or b : UberBlack |
| R or r : Return to Main Menu |
-------------------------------------

What I have tried:

Java

Scanner t = new Scanner(System.in);
      int cho;
       do {
          System.out.println("----------------------------------------------------");
          System.out.printf("%-11s%10s%11s", "###", "Welcome to Uber Fare Calculator", "###\n");
          System.out.println("----------------------------------------------------");
          System.out.println("| 1 : Get fare information about available rides   |");
          System.out.println("| 2 : Get a Fare Estimate for your Journey         |");
          System.out.println("| 3 : Submit Rating of your Ride                   |");
          System.out.println("| 4 : Exit and display summary                     |");
          System.out.println("----------------------------------------------------");
          System.out.print(" > Please enter your choice... (1-4):");
          cho = t.nextInt();
          }while(cho<1 || cho>4);

I want when the user enter 1,2,3 or 4 go to another loops but when the user enter another choose i want this massage

Java

System.out.println("\n\t\tInvalid Choice!! Please Try again");

Posted 14-Nov-17 7:38am

Member 13511450

Updated 14-Nov-17 8:06am

OriginalGriff

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OriginalGriff · Answer 1 · 2017-11-14T08:06:00

Solution 1

do ... while continues to loop while teh condition is true:

Java

i = 0;
do {
   System.out.println(i);
   i = i + 1;
   } while (i < 5);

Will print:

Your condition is only true when cho is either less than 1 or greater than 4: it is false for all values of cho in the set {1, 2, 3, 4}
So when a user enters a valid menu choice, it immediately exits the loop.
Change your condition, add the code to handle your menu choices, and it should start to work.

Posted 14-Nov-17 8:06am

OriginalGriff

Comments

Member 13511450 14-Nov-17 14:10pm

Where I can add this code
System.out.println("\n\t\tInvalid Choice!! Please Try again");

OriginalGriff 14-Nov-17 14:25pm

As part of the code you have yet to write to handle your menu choices! If you don't find a valid choice, you print that and go round again.