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help please. problems with while and switch statements.

Discussion in 'Java' started by loki556, Oct 18, 2010.

  1. loki556

    loki556 New Member

    Joined:
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    this is what i have
    Code:
    import java.util.Scanner;
    import java.util.Random;
    public class Assignment4 {
    
        /* merle ledbetter
         * MWF 1255
         * assignment 4
         */
        
    
        public static void main(String[] args){
            Scanner s= new Scanner(System.in);    
            int tries= 0;
            
            
            printMenu();
            char character = s.next().charAt(0);
            while(character != 'q'){
                switch(character){
            
            case 'a':
                System.out.println("you have selected Grid of Characters.");
                System.out.println("What is number you want to generate? [0 to 500000000]");
                int number= s.nextInt();
                while((number > 500000000)||(number< 0)){
                    System.out.println("the number is not within the range 0 to 500000000 try again");
                    number= s.nextInt();
                    }
                Random generator = new Random();
                int rand = generator.nextInt(number);
                System.out.println(rand);
                while(rand != number){
                    tries++;
                     rand= generator.nextInt(number);                
                }
                System.out.println(tries);
                System.out.println(rand);
                System.out.println(number);
                break;
            
            case 'b': case'B':
                //blah blah blah balh
                // blah blah blah blah
                break;
            
            case 'c': case'C':
                // blah blah blah blah 
                // blah blah blah
            break;
            
            case'd': case'D':
                // blah blah blah
                // blah blah blah
            break;
            
            case'e': case'E':
                // blah blah blah
                // blah blah blah
            break;
            
            case'q': case'Q':
                // blah blah blah
                // blah blah blah
            break;
            default:
                System.out.println("invalid selection try again");
                break;
                }
            }
        }
    
        public static void printMenu(){
            //opening prompt
            System.out.println("Welcome to the random task machine. Please make a selection." + "\n" +"-------------------------");
            System.out.println("A. Grid of Characters");
            System.out.println("B. How Many Tries");
            System.out.println("C. Triangle of Characters");
            System.out.println("D. Even/Odd Printing");
            System.out.println("E. Palindrome Checker");
            System.out.println("Q. Quit");
    
    i cannot get the case a to work and i need to program to iterate until q is selected.
     
    Last edited by a moderator: Oct 18, 2010
  2. loki556

    loki556 New Member

    Joined:
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    the program*
     
  3. virxen

    virxen New Member

    Joined:
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    see the changes in the code

    Code:
    import java.util.Scanner;
    import java.util.Random;
    public class Assignment4 {
    
        /* merle ledbetter
         * MWF 1255
         * assignment 4
         */
        
    
        public static void main(String[] args){
            Scanner s= new Scanner(System.in);    
    
            char character = '1';
            while(character != 'q'){
                int tries= 0;
                printMenu();
                character=s.next().charAt(0);
                switch(character){
            
            case 'a':case 'A':
                System.out.println("you have selected Grid of Characters.");
                System.out.println("What is number you want to generate? [0 to 500000000]");
                int number= s.nextInt();
                while((number > 500000000)||(number< 0)){
                    System.out.println("the number is not within the range 0 to 500000000 try again");
                    number= s.nextInt();
                    }
                Random generator = new Random();
                int rand = -1;
                while(rand != number){
                    tries++;
                     rand= 1+generator.nextInt(number);                
                }
                System.out.println("total tries="+tries);
                System.out.println("rand="+rand);
                System.out.println("number="+number);
                break;
            
            case 'b': case'B':
                //blah blah blah balh
                // blah blah blah blah
                break;
            
            case 'c': case'C':
                // blah blah blah blah 
                // blah blah blah
            break;
            
            case'd': case'D':
                // blah blah blah
                // blah blah blah
            break;
            
            case'e': case'E':
                // blah blah blah
                // blah blah blah
            break;
            
            case'q': case'Q':
                // blah blah blah
                // blah blah blah
            break;
            default:
                System.out.println("invalid selection try again");
                break;
                }
            }
        }
    
        public static void printMenu(){
            //opening prompt
            System.out.println("Welcome to the random task machine. Please make a selection." + "\n" +"-------------------------");
            System.out.println("A. Grid of Characters");
            System.out.println("B. How Many Tries");
            System.out.println("C. Triangle of Characters");
            System.out.println("D. Even/Odd Printing");
            System.out.println("E. Palindrome Checker");
            System.out.println("Q. Quit");
    }
    }
    
    
     

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