Help Explain

[Tthuta Soe]

I finished my assignment 1 ok. but I was sick for like last 2 session of my course, so I miss some array and things. I can't do properly my assignment 2. Can you guys explain things and crack me some codes ? please explain me line by line or give me a link where I can read about this.

[Campbell Ritchie]

And what have you done so far? Why do you think you need to know about arrays? If you have been ill, have you contacted your teacher for help? That may be a valid reason for additional help.

[J. Kevin Robbins]

Do you have working code for question 3 of assignment 1? Let's start there. Post that code (please use code tags) and we'll talk about how you would go about modifying it to meet the requirements of assignment 2.

[salvin francis]

Tthuta Soe wrote: .. I was sick for like last 2 session of my course, so I miss some array and things...

Oh that's bad mate. Here's how I can help out, Instead of helping in your assignment, can we first know the topics that you skipped so that we can give you good tutorial links on the same ?

Here's a good one on Arrays :
https://docs.oracle.com/javase/tutorial/java/nutsandbolts/arrays.html

[salvin francis]

Here's a simple code structure to help you out. Hopefully, you would be able to fill in the gaps

class Assignment2 {
	public Assignment2() {
	}
	
	private String[] readUserNames() {
		//-- You need to read out the names here...
	}

	private int[] readUserMarks() {
		// You need to collect marks here
	}
	
	public void readAndCalculateGrades() {
		String[] usernames = readUserNames();
		int marks[][] = new int[usernames.length][];
		
		int usernameWalker = 0;
		for(String user : usernames){
			System.out.println("Enter marks for " + user);
			marks[usernameWalker++] = readUserMarks();
		}
		
		//-- Now, you would need some code to calculate test score,
		//-- a method to calculate grade
		//-- a method to output class average
	}

	public static void main(String[] args) {
		Assignment2 assignment2 = new Assignment2();
		assignment2.readAndCalculateGrades();
	}
}

[Tthuta Soe]

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package Assigntment;

/**
 *
 * @author thuta
 */
public class oneone 

{
        public static void main(String[]anything)
        
        {
          //checkValidDate("01/30/1992");
           // checkValidDate("02/29/2016");
            checkValidDate("01/02/2016");
        }
        
        public static void checkValidDate(String data)
                
        {
            int dataLength = data.length();
            if (dataLength != 10)
            {
                System.out.println("Invalid date");
            }
            
            else
            {
                String separator= data.substring(2,3);
                String separator1=data.substring(5,6);
                if(separator.equals("/") == false || separator1.equals("/")==false)
                {
                    System.out.println("Invalid Date");
                }
                else
                {
                    String monthStr = data.substring(0,2);
                    String yearStr = data.substring( 6,10);
                    String dayStr = data.substring(3,5);
                    int month = Integer.parseInt( monthStr );
                    int year = Integer.parseInt( yearStr );
                    int day = Integer.parseInt ( dayStr );
                    
                    if (month<0 || month>12 || year<0 || day<0 || day>31)
                    {
                        System.out.println ("Invalid Date");
                    }
                    
                    else if (month==9 || month==6 || month==11 || month==4 && day<=30)
                    
                    {
                         System.out.println("Valid Date");
                    }
                    
                    else if(month==1 || month==3 ||month==5 ||month==7 ||month ==8 || month==10|| month==12 && day<=31)
                     {
                         System.out.println("Valid Date");
                     }   
                    
                    else if(month==2 || year==year/4 || year==year/400 && day<=29)
                    {
                          System.out.println("Valid Date");
                    }
                    
                    else if(month==2 || day<=28)
                    {
                        System.out.println("Valid Date");
                    }
                    
                    else
                    {
                        System.out.println("Invalid Date");
                    }
                       
                     
                    
                    
                   
                 }
            }
        }
    
}

This is one

[Tthuta Soe]

import java.util.Scanner;





 
public class twotwo
{
    public static void main(String[] args)
    {
        int count=0;
        int sum=0;
        int largest=0;
        int smallest=0;
        int number;
        
        
        System.out.println("Type an integer");
        Scanner twodog=new Scanner(System.in);
        number=twodog.nextInt();
          
            for(int i=0;i<number;i++)
            {
                
                sum+=number;
            System.out.println("Type an integer");
            number=twodog.nextInt();
            count++;
            }
            if(number>largest)
            {
                largest=number;
            }
           if(number<smallest)
            {
               smallest=number;
            }
        
        
        double average=sum/count;
        System.out.println("Average is "+ average);
        System.out.println("Largest number is "+largest);
        System.out.println("Smallest number is "+smallest);
    }
}

This is two

[Tthuta Soe]

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package Assigntment;

import java.util.Scanner;

/**
 *
 * @author thuta
 */
public class threethree 
{
    public static void main(String[]argc)
    {
        Scanner input=new Scanner(System.in);
        System.out.println("Enter SomeThing");
        String phoneNumber=input.nextLine();
        for(int i=0;i<phoneNumber.length();i++)
        {
             
        System.out.print(GetNum(phoneNumber.charAt(i)));
        }
        
    }
    
    public static int GetNum(char Digits)
    {
     int ret=0;
     
       if(Character.isDigit(Digits))
       {
           System.out.print(Digits);//I think there's something wrong with this !
           
       }
       else if(Character.isLetter(Digits))
       {
           
       
           
               if(Digits=='A'||Digits=='a'||Digits=='B'||Digits=='b'||Digits=='C'||Digits=='c')
        {
            ret=1;
            
        }
        else if(Digits=='D'||Digits=='d'||Digits=='E'||Digits=='e'||Digits=='F'||Digits=='f')
        {
            ret=2;
        }
        else if(Digits=='G'||Digits=='g'||Digits=='H'||Digits=='h'||Digits=='I'||Digits=='i')
        {
            ret=3;
        }
        else if(Digits=='J'||Digits=='j'||Digits=='K'||Digits=='k'||Digits=='L'||Digits=='l')
        {
            ret=4;
        }
        else if(Digits=='M'||Digits=='m'||Digits=='N'||Digits=='n'||Digits=='O'||Digits=='o')
        {
            ret=5;
        }
        else if(Digits=='P'||Digits=='p'||Digits=='Q'||Digits=='q'||Digits=='R'||Digits=='r')
        {
            ret=6;
        }
        else if(Digits=='S'||Digits=='T'||Digits=='U'||Digits=='s'||Digits=='t'||Digits=='u')
        {
            ret=7;
        }
        else if(Digits=='V'||Digits=='v'||Digits=='W'||Digits=='X'||Digits=='w'||Digits=='x')
        {
            ret=8;
        }
        else if(Digits=='y'||Digits=='Y'||Digits =='z'||Digits=='Z')
        {
            ret=9;
        }
        
               
            
       }
        return ret;
    }
}

This is three but not correct. It's as far as I reached

[Dave Tolls]

Tthuta Soe wrote: This is three but not correct. It's as far as I reached

And what is the issue with it?
What does it do, and what should it do?

[Tthuta Soe]

There's a question above ! My Assignments

[Dave Tolls]

Yes, but what does your code fail to do that is required by that assignment?

This is your problem, remember, and you are asking people to help you, so it's generally a good idea to make it as easy as possible for them. It helps us and, as a result, helps you.

[Tthuta Soe]

Hi,

question 1
To read a valid date.

Question 2.
Use a while loop to keep reading an integer from the keyboard. The loop will stop when the user enter an (any) negative number.
When the loop stops, you need to print the sum, average, lowest and highest numbers.

Question 3.
Read a String from the keyboard. The String represents a phone number. The phone number can contains letters:
A, B, C, a, b, c --> 1
D, E, F, d, e, f --> 2

The program is to convert the String to a phone number and display it.

[Tthuta Soe]

I haven't start the assignment 2 yet

[Knute Snortum]

Some notes on your first program:

* Package names are lowercase.
* Class names start with an uppercase letter.
* Don't write

if(separator.equals("/") == false || separator1.equals("/")==false)

write:

if (!separator.equals("/") || !separator1.equals("/"))

* This code:

if (month==9 || month==6 || month==11 || month==4 && day<=30)

...is probably wrong. && has a higher precedence than ||, so this evaluates like:

if (month==9 || month==6 || month==11 || (month==4 && day<=30))

What you probably want is

if ((month==9 || month==6 || month==11 || month==4) && day<=30)

* The following is wrong:

if(month==2 || year==year/4 || year==year/400 && day<=29)

This says, "If the year is equal to the year divided by 4...". What you want is, "If the year is evenly divisible by 4..." To do this, use the modulo operator (%).

if(month==2 || year % 4 == 0...

This says, "If the remainder after dividing by 4 is zero..."

[Dave Tolls]

Tthuta Soe wrote:Hi,
...

Does your code work, though?

This is as important as what it is supposed to do.
What does it currently do?
Why is that incorrect?

It helps a lot to narrow down what problem you are having, otherwise we have to look through the whole code (and possibly compile and execute it) in order to find out what it is that you are having problems with.
Many of us don't have all that much time to expend on this, so the more effort you expend presenting your problem then the more likely you are to actually get responses to your issue.

[Campbell Ritchie]

Knute Snortum wrote:. . .
* The following is wrong:

if(month==2 || year==year/4 || year==year/400 && day<=29)

This says, "If the year is equal to the year divided by 4...". What you want is, "If the year is evenly divisible by 4..." To do this, use the modulo operator (%).

if(month==2 || year % 4 == 0...

This says, "If the remainder after dividing by 4 is zero..."

You have the same problem with precedences there; you would need a second pair of () in that expression.

I think all these ifs are confusing and error‑prone. I suggest you can work out a daysInMonth variable much more neatly with a switch statement.

[Tthuta Soe]

1 and 2 is working but 3 is not

[Knute Snortum]

Saying "it doesn't work" doesn't tell us enough. What did you except? What happened instead? Did you get an error? What's the stack trace?

[Tthuta Soe]

In question 3 if input is go adg1234 the out put gotta show 123-1234. or input is ad4j123 the out put should be 124-4123. something like that it will only read change the alphabet to numbers and read the numbers still as the numbers.
It won't execute if the number is longer or shorter than 7 words. It won't execute if you put other signs.and the hyphen will be included in after the third number.My program is working on the alphabet part but number parts is not working.
and I don't know how to put the hyphen in between. that's what's happening.

[Knute Snortum]

Ask yourself this: is GetNum() supposed to return something or print something? Some other things:

* Start variable and method names with a lowercase letter.
* Is Digits a good argument name? How many digits will it contain? Will it contain only digits?
* When you find yourself doing something like this:

if(Digits=='A'||Digits=='a'...

...it probably makes sense to lowercase the whole string first.