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Thread: Problem with Scanner

  1. #1
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    Default Problem with Scanner

    Hi!

    I am new to this forum. I am a beginner in Java programming and have a problem with one of my assignments.

    I need the user to enter the size of a diamond (through the Scanner) to be printed out but the below code does not compile ("cannot find symbol: variable Size. I want the user enter the size only once at the beginning of the program and then I want to use it within different methods drawing different parts of the figure. Do I have to define a variable inside each of the methods? Any ideas how to fix this?
    Many thanks in advance!

    PHP Code:
     import java.util.*; 

    public class 
    Question2 

        public static 
    void main(String[] args)         { 
            
    Scanner keyboard = new Scanner(System.in); 
            
    System.out.print("Please enter the size of diamond you want to print out: "); 
            
    int Size keyboard.nextInt(); 
            
    line(); 
            
    drawtop(); 
            
    middleline(); 
            
    drawbtm(); 
            
    line(); 


        } 

        public static 
    void line() { 
              
    System.out.print("|"); 
            for (
    int i 1<= Size 2i++) { 
                
    System.out.print("-"); 
            } 
            
    System.out.print("*"); 
            for (
    int i 1<= Size 2i++) { 
                
    System.out.print("-"); 
            } 
            
    System.out.print("|"); 
            
    System.out.println(" "); 
        } 


  2. #2
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    Default Re: Problem with Scanner

    Quote Originally Posted by Rafal75 View Post
    Hi!

    I am new to this forum. I am a beginner in Java programming and have a problem with one of my assignments.

    I need the user to enter the size of a diamond (through the Scanner) to be printed out but the below code does not compile ("cannot find symbol: variable Size. I want the user enter the size only once at the beginning of the program and then I want to use it within different methods drawing different parts of the figure. Do I have to define a variable inside each of the methods? Any ideas how to fix this?
    Many thanks in advance!

    PHP Code:
     import java.util.*; 

    public class 
    Question2 

        public static 
    void main(String[] args)         { 
            
    Scanner keyboard = new Scanner(System.in); 
            
    System.out.print("Please enter the size of diamond you want to print out: "); 
            
    int Size keyboard.nextInt(); 
            
    line(); 
            
    drawtop(); 
            
    middleline(); 
            
    drawbtm(); 
            
    line(); 


        } 

        public static 
    void line() { 
              
    System.out.print("|"); 
            for (
    int i 1<= Size 2i++) { 
                
    System.out.print("-"); 
            } 
            
    System.out.print("*"); 
            for (
    int i 1<= Size 2i++) { 
                
    System.out.print("-"); 
            } 
            
    System.out.print("|"); 
            
    System.out.println(" "); 
        } 
    Hello Rafal75!
    If you want to use Size in multiple methods you can declare it in the same level with the methods (in other words inside the class but outside the methods) - be careful with static fields and methods. And also you should better start your variable name with lower case by convention.

  3. #3
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    Default Re: Problem with Scanner

    Quote Originally Posted by andreas90 View Post
    Hello Rafal75!
    If you want to use Size in multiple methods you can declare it in the same level with the methods (in other words inside the class but outside the methods) - be careful with static fields and methods. And also you should better start your variable name with lower case by convention.
    since it appears you are not modifing the variable inside your methods you could also simply pass it to each of your methods
    eg:
     import java.util.*;  
     
    public class Question2 {  
     
        public static void main(String[] args)         {  
            Scanner keyboard = new Scanner(System.in);  
            System.out.print("Please enter the size of diamond you want to print out: ");  
            int size = keyboard.nextInt();  
            line(size);  
            drawtop(size);  
            middleline(size);  
            drawbtm(size);  
            line(size);  
     
     
        }  
     
        public static void line(int size) {  
              System.out.print("|");  
            for (int i = 1; i <= size / 2; i++) {  
                System.out.print("-");  
            }  
            System.out.print("*");  
            for (int i = 1; i <= size / 2; i++) {  
                System.out.print("-");  
            }  
            System.out.print("|");  
            System.out.println(" ");  
        }

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