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Using a do-while loop on a Switch menu – Artificial Intelligence

I’m trying to make the program return to the menu list if any character other than 1 – 11 is selected when prompted "Please enter your Module Choice" using a do while loop…

Currently even if the user doesn’t select a valid option the program just continues to run

I expect after "Please select a valid module" for it to return to the menu list.

Scanner scanner = new Scanner(System.in);
    
public void moduleSelection() {

    
    System.out.println("1t Algorithms");
    System.out.println("2t Advanced Programming");
    System.out.println("3t Computer Architecture and Operating Systems");
    System.out.println("4t Artificial intelligence and Machine Learning");
    System.out.println("5t Computer and Mobile Networks");
    System.out.println("6t Software Engineering");
    System.out.println("7t Big Data Analyics");
    System.out.println("8t Cyber Security Threats");
    System.out.println("9t Research Methods");
    System.out.println("10t Research Project Proposal");
    System.out.println("11t Individual Research Project");
    

    System.out.println("Please entire your Module choice");
    
    int choice;
    
    choice = scanner.nextInt();
    
    switch (choice)
    {
    case 1: System.out.println("Algorithms");
    break;
    case 2: System.out.println("Advanced Programming");
    break;
    case 3: System.out.println("Computer Architecture and Operating Systems");
    break;
    case 4: System.out.println("Artificial intelligence and Machine Learning");
    break;
    case 5: System.out.println("Computer and Mobile Networks");
    break;
    case 6: System.out.println("Software Engineering");
    break;
    case 7: System.out.println("Big Data Analytics");
    break;
    case 8: System.out.println("Cyber Security Threats");
    break;
    case 9: System.out.println("Research Methods");
    break;
    case 10: System.out.println("Research Project Proposal");
    break;
    case 11: System.out.println("Individual Research Project");
    break;
    default: System.out.println("Please select a valid Module");
    break;
    }
    
}
Tags:

7

Answers


  1. 0

    a. Define a variable to verify user has entered a validNumber.
    b. in do while loop, check if number is valid or not

    E.g:

    do{
System.out.println("Please entire your Module choice");

int choice;

choice = scanner.nextInt();
boolean invalidChoice=false;
switch (choice){
case 1:
...
break;
case 2:
...
break;

default: 
invalidChoice=true;
print ("Please enter valid choice");

} while(invalidChoice);
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  2. 0

    Based on my assumptions as added as part of comments, better to add help text for the user like ” Please entire your Module choice (1-11) “

    int choice=0;
boolean isChoiceValid ;

public void moduleSelection() {
while(!isChoiceValid) {
System.out.println("1t Algorithms");
System.out.println("2t Advanced Programming");
System.out.println("3t Computer Architecture and Operating Systems");
System.out.println("4t Artificial intelligence and Machine Learning");
System.out.println("5t Computer and Mobile Networks");
System.out.println("6t Software Engineering");
System.out.println("7t Big Data Analyics");
System.out.println("8t Cyber Security Threats");
System.out.println("9t Research Methods");
System.out.println("10t Research Project Proposal");
System.out.println("11t Individual Research Project");
System.out.println("Please entire your Module choice (1-11)");
choice = scanner.nextInt();
if(choice>=1 && choice<=11)
{
isChoiceValid =true;
}
}
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  3. 0

    You need to keey switch case in side loop.
    Apart from that you need to provide an option to exit from loop.
    I use exist condition as 99 as input.

         public static void main(String[] args) {


         boolean doYouWantToExit = false;
         Scanner scanner = new Scanner(System.in);
         do {
             System.out.println("1t Algorithms");
             System.out.println("2t Advanced Programming");
             System.out.println("3t Computer Architecture and Operating Systems");
             System.out.println("4t Artificial intelligence and Machine Learning");
             System.out.println("5t Computer and Mobile Networks");
             System.out.println("6t Software Engineering");
             System.out.println("7t Big Data Analyics");
             System.out.println("8t Cyber Security Threats");
             System.out.println("9t Research Methods");
             System.out.println("10t Research Project Proposal");
             System.out.println("11t Individual Research Project");
             System.out.println("99t Do you want to exist");
             System.out.println("Please entire your Module choice");
             int choice;
             choice = Integer.parseInt(scanner.nextLine());
             switch (choice)
             {
             case 1: System.out.println("Algorithms");
             break;
             case 2: System.out.println("Advanced Programming");
             break;
             case 3: System.out.println("Computer Architecture and Operating Systems");
             break;
             case 4: System.out.println("Artificial intelligence and Machine Learning");
             break;
             case 5: System.out.println("Computer and Mobile Networks");
             break;
             case 6: System.out.println("Software Engineering");
             break;
             case 7: System.out.println("Big Data Analytics");
             break;
             case 8: System.out.println("Cyber Security Threats");
             break;
             case 9: System.out.println("Research Methods");
             break;
             case 10: System.out.println("Research Project Proposal");
             break;
             case 11: System.out.println("Individual Research Project");
             break;
             case 99: 
                 doYouWantToExit = true;
             break;
             default: System.out.println("Please select a valid Module");
             break;
             }

         }while(!doYouWantToExit); 
     }
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  4. 0

    You can do this by simply adding while or do-while loop

    Updated your method. Check Out:

    private void moduleSelection() {
    int choice = -1;

    while (true) { 
        System.out.println("1t Algorithms");
        System.out.println("2t Advanced Programming");
        System.out.println("3t Computer Architecture and Operating Systems");
        System.out.println("4t Artificial intelligence and Machine Learning");
        System.out.println("5t Computer and Mobile Networks");
        System.out.println("6t Software Engineering");
        System.out.println("7t Big Data Analyics");
        System.out.println("8t Cyber Security Threats");
        System.out.println("9t Research Methods");
        System.out.println("10t Research Project Proposal");
        System.out.println("11t Individual Research Project");
        System.out.println("0t Exit");
        System.out.println("Please entire your Module choice");

        choice = scanner.nextInt();
        switch (choice) {
        case 0:
            System.exit(1);
            break;
        case 1:
            System.out.println("Algorithms");
            break;
        case 2:
            System.out.println("Advanced Programming");
            break;
        case 3:
            System.out.println("Computer Architecture and Operating Systems");
            break;
        case 4:
            System.out.println("Artificial intelligence and Machine Learning");
            break;
        case 5:
            System.out.println("Computer and Mobile Networks");
            break;
        case 6:
            System.out.println("Software Engineering");
            break;
        case 7:
            System.out.println("Big Data Analytics");
            break;
        case 8:
            System.out.println("Cyber Security Threats");
            break;
        case 9:
            System.out.println("Research Methods");
            break;
        case 10:
            System.out.println("Research Project Proposal");
            break;
        case 11:
            System.out.println("Individual Research Project");
            break;
        default:
            System.out.println("Please select a valid Module");
            break;
        }
    }
}
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  5. 0

    you may change your code like : 

    int choice;
choice = scanner.nextInt();

if(choice>=1&& choice<=11){
switch (choice)
{ ...
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  6. 0

    You can use a label:

        loop:
    while (true) {
        System.out.println("Please entire your Module choice");

        int choice;

        choice = scanner.nextInt();

        switch (choice) {
            case 1:
                System.out.println("Algorithms");
                break loop;
            case 2:
                System.out.println("Advanced Programming");
                break loop;
            case 3:
                System.out.println("Computer Architecture and Operating Systems");
                break loop;
            case 4:
                System.out.println("Artificial intelligence and Machine Learning");
                break loop;
            case 5:
                System.out.println("Computer and Mobile Networks");
                break loop;
            case 6:
                System.out.println("Software Engineering");
                break loop;
            case 7:
                System.out.println("Big Data Analytics");
                break loop;
            case 8:
                System.out.println("Cyber Security Threats");
                break loop;
            case 9:
                System.out.println("Research Methods");
                break loop;
            case 10:
                System.out.println("Research Project Proposal");
                break loop;
            case 11:
                System.out.println("Individual Research Project");
                break loop;
        }
    }
}
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  7. 0 
    public void moduleSelection() {

boolean switch;

do{

switch = false;

System.out.println("1t Algorithms");
System.out.println("2t Advanced Programming");
System.out.println("3t Computer Architecture and Operating Systems");
System.out.println("4t Artificial intelligence and Machine Learning");
System.out.println("5t Computer and Mobile Networks");
System.out.println("6t Software Engineering");
System.out.println("7t Big Data Analyics");
System.out.println("8t Cyber Security Threats");
System.out.println("9t Research Methods");
System.out.println("10t Research Project Proposal");
System.out.println("11t Individual Research Project");


System.out.println("Please entire your Module choice");

int choice;

choice = scanner.nextInt();

switch (choice)
{
case 1: System.out.println("Algorithms");
break;
case 2: System.out.println("Advanced Programming");
break;
case 3: System.out.println("Computer Architecture and Operating Systems");
break;
case 4: System.out.println("Artificial intelligence and Machine Learning");
break;
case 5: System.out.println("Computer and Mobile Networks");
break;
case 6: System.out.println("Software Engineering");
break;
case 7: System.out.println("Big Data Analytics");
break;
case 8: System.out.println("Cyber Security Threats");
break;
case 9: System.out.println("Research Methods");
break;
case 10: System.out.println("Research Project Proposal");
break;
case 11: System.out.println("Individual Research Project");
break;
default: System.out.println("Please select a valid Module");
switch = true;
break;
}
}while(switch)
}
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