Finding smaller number of 2 numbers inputted by user

Sephiroth_dude · 10-10-2017 1:09pm

Thank you!

Sephiroth_dude · 12-10-2017 5:06pm

We were learning about constructs the other day and I don't fully understand why there important or why you would use them, any insight?

Buford T Justice · 12-10-2017 9:29pm

Sephiroth_dude wrote: »

We were learning about constructs the other day and I don't fully understand why there important or why you would use them, any insight?

This should help, but if you're struggling with this, then here's a more detailed explanation with examples

Talisman · 13-10-2017 12:46pm

Sephiroth_dude wrote: »

We were learning about constructs the other day and I don't fully understand why there important or why you would use them, any insight?

It helps to have an idea of what is happening in the layer below your code.

Back in 1999, the C# and Java object-oriented platforms were implemented in C. By today's standards C is a low level language. It is a level above assembly language which is the human readable translation of machine code. Machine code is the hexadecimal gibberish that you may have seen if you were ever curious enough to open an executable file in a text editor.

In C there were just plain old data structures and functions. Because the code is written at a low level the developer has to do a lot of things for themselves, e.g. allocate memory to store data structures, remember to deallocate the memory when finished with it, pass memory pointers to functions etc. There was a lot of stuff that was easy to screw up and nearly always bad things happened as a result.

The object oriented languages operate at a higher level, a class combines the data structures and the functions to operate on the data into a single entity. In order to use an object, it must first be loaded into memory - this is where the constructor comes into play. The constructor magically allocates the memory for the instance of the class (object) and may also initialise values for class variables etc. so that they are available to use.

Essentially the constructor is talking to the underlying layer and asks it to do all of the dirty work so that the developer doesn't have to worry about it. The 'new' keyword and the constructor function make object oriented languages sweeter for human use.

PrzemoF · 14-10-2017 10:16pm

Anima wrote: »

I'd probably disagree, seeing as it will be less readable. There is no performance reason to split it up either.

No, there is no real gain in that very example. But if you have the habit of keeping large pieces of code in try-catch you'll sooner or later catch too much.

Sephiroth_dude · 23-10-2017 3:16pm

Trying too write a program where by the user can select from an option from a menu and then It will bring them too that function where they will enter values and they get calculated, I'm have a problem with my the electrical method, when you select one it just prints "Electrical charge" and doesn't ask the user for input, its driving me demented, any advice please?

static void Main(string[] args)
        {
            

           
              menuPrompt();
              ElectricalCharges();
        }

               
                


              
               

        

        


        static void menuPrompt()
        {
            Console.WriteLine("Please enter a selection between 1 and 2 or press 0 too exit");
           
            

             int choice = 0;
            do
            {


               
                


                
                choice = int.Parse(Console.ReadLine());
                switch (choice)
                {
                    case 1:
                        Console.WriteLine("Electrial Charges Calculator ");
                        break;

                    case 2:
                        Console.WriteLine("Water Charges Calculator");
                        break;
                    case 0: 
                        Console.WriteLine("Thank you! Come again! ");
                        break;

                    default:
                        Console.WriteLine("Not a valid selection!");
                        break;

                }


                } while (choice != 0);
                







           


        

        


        
        }

           static double ElectricalCharges()
           
           {

               double PerHour = 0.20;
               double TotalCost = 0;

               Console.WriteLine("Please enter the number of electric units used this month :");
               double Charge = int.Parse(Console.ReadLine());

               PerHour = PerHour * Charge;
               return TotalCost;

              
               }

Buford T Justice · 23-10-2017 3:33pm

To be fair, there's a few things wrong with what you've written. Have a look at the following and see if you can understand it. Note, the return value from the ElectricalCharge method is not handled

        static void Main(string[] args)
        {
            menuPrompt();
        }
        static void menuPrompt()
        {
            int choice =0;
            while (choice != -999)
            {
            Console.WriteLine("Please enter a selection between 1 and 2 or press -999 to exit");
            choice = Convert.ToInt32(Console.ReadLine());

                switch (choice)
                {
                    case 1:
                        Console.WriteLine("Electrial Charges Calculator ");
                        ElectricalCharges();
                        break;

                    case 2:
                        Console.WriteLine("Water Charges Calculator");
                        break;
                    case 0:
                        Console.WriteLine("Thank you! Come again! ");
                        break;

                    default:
                        Console.WriteLine("Not a valid selection!");
                        break;

                }
            }
        }

        static double ElectricalCharges()
        {
            double PerHour = 0.20;
            double TotalCost = 0;

            Console.WriteLine("Please enter the number of electric units used this month :");
            double Charge = int.Parse(Console.ReadLine());

            PerHour = PerHour * Charge;
            return TotalCost;
        }
    }

Greyian · 23-10-2017 3:39pm

Sephiroth_dude wrote: »
Trying too write a program where by the user can select from an option from a menu and then It will bring them too that function where they will enter values and they get calculated, I'm have a problem with my the electrical method, when you select one it just prints "Electrical charge" and doesn't ask the user for input, its driving me demented, any advice please?
static void Main(string[] args)
{
	menuPrompt();
	ElectricalCharges();
}

static void menuPrompt()
{
	Console.WriteLine("Please enter a selection between 1 and 2 or press 0 too exit");
	int choice = 0;
	do
	{
		choice = int.Parse(Console.ReadLine());
		switch (choice)
		{
			case 1:
				Console.WriteLine("Electrial Charges Calculator ");
				break;
			case 2:
				Console.WriteLine("Water Charges Calculator");
				break;
			case 0: 
				Console.WriteLine("Thank you! Come again! ");
				break;
			default:
				Console.WriteLine("Not a valid selection!");
				break;
		}

	} while (choice != 0);
}

static double ElectricalCharges()           
{
	double PerHour = 0.20;
	double TotalCost = 0;

	Console.WriteLine("Please enter the number of electric units used this month :");
	double Charge = int.Parse(Console.ReadLine());

	PerHour = PerHour * Charge;
	return TotalCost;
}

OK, let's work through what your code is doing:

The Main method is calling menuPrompt, and is then calling ElectricalCharges. It should not call the ElectricalCharges method, as that should be determined by the user's selection inside the menuPrompt method.

In the menuPrompt functionality, you're asking the user to choose an option. You are then processing the option. If it is 1, you are outputting "Electrical Charges Calculator", but you aren't actually doing anything beyond that. This is where the ElectricalCharges method should be called.

As it stands, this is the logic your program is carrying out:

1) The menuPrompt functionality is called.
2) The user is prompted to select an option. The user provides their input.
3) The user's input is used to select the option. If the option selected is not 0, output the selected option and then return to Step 2.
If the option selected is 0, tell the user thank you.
4) Carry out the ElectricalCharges method, as it takes place after menuPrompt in the Main thread.

You need to remove ElectricalCharges from the Main thread, and instead have it in the switch statement (under Case 1).

Sephiroth_dude · 23-10-2017 10:41pm

Buford T Justice wrote: »

the return value from the ElectricalCharge method is not handled

You mean for an exception?

Mr. CooL ICE · 24-10-2017 9:51am

I'm kinda confused as to what the program is supposed to be doing.

Sephiroth_dude wrote: »

You mean for an exception?

No. As in, you are calling the ElectricalCharge method but not doing anything with it. ElectricalCharge is set to return a value, but the value it is returning is not being assigned to anything.

Wouldn't it make more sense to call ElectricalCharge from inside the loop? From Inside the switch statement. Think of it this way; user enters the option for ElectricalCharge, so it would make sense to then call ElectricalCharge.

Sephiroth_dude · 24-10-2017 10:59am

Nicolas Cage wrote: »

I'm kinda confused as to what the program is supposed to be doing.

Well think of it as a utilities menu, where by you can choose too work out your water charges or your electricity, so when the user chooses lets water it will bring you down too that method the user enters how many litres of water they've used and it calculates it, same idea for the electricity, I want too eventually flesh out then and add other things too it, if that makes sense?

Sephiroth_dude · 06-11-2017 10:58pm

How can I separate it this out ? I want too have a one line space after yearly salary?for each employee.

The code in case ye want too have a look

class Employee
    {
        public string employeeName;
        public int employeeAge;
        public string employeeDepartment;
        public int employeeNumber;
        public int weeklyHours;
        public double taxRate;
        public int yearsOfService;
        public int monthlySalary;
        public int yearlyIncome;

        public Employee() {}

        public Employee(string inEmployeeName,int inEmployeeAge,string inEmployeeDepartment,int inEmployeeNumber,int inWeeklyHours,double inTaxRate,int inYearsOfService,int inMonthlySalary,int inYearlyIncome)
        {
          employeeName = inEmployeeName;
          employeeAge = inEmployeeAge;
          employeeDepartment = inEmployeeDepartment;
          employeeNumber = inEmployeeNumber;
          weeklyHours = inWeeklyHours;
          taxRate = inTaxRate;
          yearsOfService = inYearsOfService;
          monthlySalary = inMonthlySalary;
          yearlyIncome = inYearlyIncome;
       }

        public void EmployeeDetails()
        { 
           Console.WriteLine("Employee's Name             :"+employeeName);
           Console.WriteLine("Employee's Age              :"+employeeAge);
           Console.WriteLine("Employee's Department       :"+employeeDepartment);
           Console.WriteLine("Employee's Number           :"+employeeNumber);
           Console.WriteLine("Employee's Weekly Hours:    :"+weeklyHours); 
           Console.WriteLine("Employee's Tax Rate         :"+taxRate);
           Console.WriteLine("Employee's Years of service :"+yearsOfService);
           Console.WriteLine("Employee's Monthly Salary   :"+monthlySalary);
           Console.WriteLine("Employee's Yearly Salary    :"+yearlyIncome);

namespace Information
{
    class Program
    {
        static void Main(string[] args)
        {
            Employee a1 = new Employee("Kevin O Sullivan",31,"Software Writer",5667,39,0.20,5,3500,0);
            a1.EmployeeDetails();

            Employee b2 = new Employee("Mary Murphy",28,"Software Writer",5442,39,0.20,6,3600,0);
            b2.EmployeeDetails();

            Employee c3 = new Employee("John Cusack", 35, "Software Tester", 5876, 39, 0.20, 10, 4000, 0);
            c3.EmployeeDetails();

            Employee d4 = new Employee("Teresa O Reilly",30,"Software Tester",5798,39,0.20,7,3800,0);
            d4.EmployeeDetails();

            Employee e5 = new Employee("Timmy Jones",35,"Payroll",6723,39,0.42,8,4200,0);
            e5.EmployeeDetails();

            Employee f6 = new Employee("Ciara O Mahony",40,"Head Accountant",4432,50,0.42,15,6000,0);
            f6.EmployeeDetails();

            Employee g7 = new Employee("Chris Murphy",43,"Technical Writer",3445,40,0.42,12,4500,0);
            g7.EmployeeDetails();


            Employee h8 = new Employee("Maire Higgins",49,"CEO/Manager",4214,55,0.42,25,7000,0);
            h8.EmployeeDetails();

As always, thanks for the help.

begbysback · 06-11-2017 11:25pm

Write a blank/null line in EmployeeDetails method

Sephiroth_dude · 06-11-2017 11:45pm

begbysback wrote: »

Write a blank/null line in EmployeeDetails method

You mean like this consolewriteline("" ) ;?

Buford T Justice · 07-11-2017 12:34am

Console.WriteLine("Employee's Yearly Salary    :"+yearlyIncome + "\n");

Talisman · 07-11-2017 11:04am

This isn't directly related to your question but will help you produce cleaner code.

Instead of manually padding your strings you can use the optional alignment component to do the work for you. The alignment component is a signed integer which indicates the preferred formatted width.

The following composite format string left-aligns the field name in a 30-character field. Negative numbers result in left alignment, positive numbers result in right alignment of the value.

Console.WriteLine("{0,-30} : {1}\n", "Employee's Name", name);

See Composite Formatting in the .NET documentation for more details.

Sephiroth_dude · 10-11-2017 9:41am

Let say I have a method

public int Calculate(int num1, int num2);

{
           return answer = num1 +num2;
      
}

How would I pass the answer too another method too do another calculation with that answer? is it even possible too do it?

Remouad · 10-11-2017 11:21am

You've defined a return type (int) so you can do the following.

int param = Calculate(num1, num2);

AnotherCalculation(param);

or you could short cut it

AnotherCalculation(Calculate(num1, num2));

Remouad · 10-11-2017 11:43am

Also in your function your return should be just

return num1+num2

Unless "answer" is a class level variable and you want it to hold the value.

In that case you can change the return type to void and pass "answer" to your next method.

Sephiroth_dude · 10-11-2017 11:51am

Remouad wrote: »
Also in your function your return should be just
return num1+num2
Unless "answer" is a class level variable and you want it to hold the value.

In that case you can change the return type to void and pass "answer" to your next method.

So if the answer = 10, the next method will know this?

Will that work as well for instance variables?

Remouad · 10-11-2017 1:08pm

Sephiroth_dude wrote: »

So if the answer = 10, the next method will know this?

Will that work as well for instance variables?

Yes & yes.
All depends on your implementation.
Rough example below.

    class NumberFidgit
    {
        public int answer;

        public void Sum(int num1, int num2)
        {
            answer = num1 + num2;
        }

        public void Square()
        {
            answer = answer * answer;
        }
    }

    class NumberCaller
    {
        public NumberFidgit fidgit = new NumberFidgit();
        public void populateFigit()
        {
            fidgit.Sum(1, 2);//answer =3
            fidgit.Square();//answer =9

            incrementByReference(ref fidgit.answer); //answer =10
            int i = incrementByValue(fidgit.answer);//i=11, answer still 10
            fidgit.answer = incrementByValue(fidgit.answer);//answer = 11
            incrementVariable();//answer=12
        }

        public void incrementByReference(ref int i)
        {
            i = i + 1;
        }

        public int incrementByValue(int i)
        {
            return i + 1;
        }

        public void incrementVariable()
        {
            fidgit.answer += 1;
        }
    }

Sephiroth_dude · 10-11-2017 1:26pm

Thanks alot Remouad!

Sephiroth_dude · 20-12-2017 12:02pm

I passed my course

and will be starting a new course 15th of January (Mobile Technologies) can't wait!

Sephiroth_dude · 20-12-2017 12:09pm

I was messing around with java a bit lately as that's what we'll be using on the new course but I Have a question regarding the code below

public class Inheritence5 {

	public static class Hero
	{
	    protected String Name;
        protected int Age;
        protected String Class;
        protected String Vocation;
        protected int Strenght;
        protected int DamageOutPut;
        protected int HitPoints;
        protected int DefensePoints;
        protected int Intelligence;
        protected int Focus;
        protected Boolean Evil;
        protected Boolean Good;
	
	public  void HeroStats()
	{
		 System.out.println("Name: " +Name);
		 System.out.println("Age: " +Age);
		 System.out.println("Class " + Class);
		 System.out.println("Vocation: " +Vocation);
		 System.out.println("Strenght: " +Strenght);
		 System.out.println("Damage Output: " +DamageOutPut);
		 System.out.println("HitPoints: " +HitPoints);
		 System.out.println("DefensePoints: " +DefensePoints);
		 System.out.println("Focus: " +Focus);
		 System.out.println("Evil: " +Evil);
		 System.out.println("Good: " +Good);
	}
	
	}
	
	public  static class Warrior extends Hero
	{
		 public int Stamina;
         public double CriticalStrike;
         
         public void SpecialStat()
         {
        	 System.out.println("Stamina: " +Stamina);
        	 System.out.println("CriticalStrike" +CriticalStrike);
         }
	}
	
	public static class Wizard extends Hero
	{
		protected int MagicalPoints;
		
		
		protected void SpecialStats()
		{
			System.out.println("MagicalPoints: " +MagicalPoints);
			
		}
	}
	
	
	public static void main(String[] args) 
	{
           Warrior Kevin = new Warrior();
           Kevin.Name = "Kevin";
	  Kevin.Age = 31;
	  Kevin.Class = "Warrior";
	 Kevin.Vocation = "Tank";
	 Kevin.Strenght = 90;
	Kevin.DamageOutPut = 200;
	Kevin.HitPoints = 350;
	Kevin.DefensePoints = 100;
	Kevin.Intelligence = 50;
	Kevin.Focus = 56;
        Kevin.Evil = false;
        Kevin.Good = true;
        Kevin.Stamina = 78;
        Kevin.CriticalStrike = 77.5;
        Kevin.HeroStats();
        Kevin.SpecialStat();
       
        System.out.println();
	    
	     Wizard Conor = new Wizard();
	     Conor.Name = "Conor";
	     Conor.Age = 32;
	     Conor.Class = "Wizard";
	     Conor.Vocation = "Healer";
	     Conor.Strenght = 40;
	     Conor.DamageOutPut = 300;
	     Conor.HitPoints = 500;
	     Conor.DefensePoints = 100;
	     Conor.Intelligence = 200;
	     Conor.Focus = 80;
	     Conor.Evil = false;
	     Conor.Good = true;
	     Conor.MagicalPoints = 500;
	     Conor.HeroStats();
	     Conor.SpecialStats();
	     
	     System.out.println();

All this program does is print out the stats of a warrior and wizard, my question is where it says public static class wizard or warrior how come I need too have the static in there? If I take it out a red like appears under new Warrior(); and the program won't run.

I have more or less the same program running in visual studio but there was no need for the static

.

Buford T Justice · 20-12-2017 12:43pm

Static members and classes are available without an instantiating them, hence no need for the new operator. The caveat is that they are not threadsafe.

Anima · 20-12-2017 12:44pm

Visual Studio and Java?

Java doesn't have static classes like that I don't think. I also don't know why those classes would be made static anyway.

BrokenArrows · 20-12-2017 1:20pm

The reason new Warrior() goes red is because it is no invalid.
Warrior and Wizard are extending Hero. Hero is static so Warrior and Wizard must also be static.

BrokenArrows · 20-12-2017 1:27pm

Anima wrote: »

Visual Studio and Java?

Java doesn't have static classes like that I don't think. I also don't know why those classes would be made static anyway.

I think you can install some extension to support java code in VS.
Java does have static classes but they must be defined inside a non static class.
Ya there is no reason to make them static at all. Hero, Wizard and Warrior should have the static removed from them.

@Sephiroth_dude The reason why you dont want them to be static is because you need them to store their own statistics for each instance of warrior.

If you created two instances of a static warrior called Jim and Bob they would both report the same statistics always.

Buford T Justice · 20-12-2017 1:30pm

BrokenArrows wrote: »

I think you can install some extension to support java code in VS.
Java does have static classes but they must be defined inside a non static class.
Ya there is no reason to make them static at all. Hero, Wizard and Warrior should have the static removed from them.

@Sephiroth_dude The reason why you dont want them to be static is because you need them to store their own statistics for each instance of warrior.

If you created two instances of a static warrior called Jim and Bob they would both report the same statistics always.

Hence, thread safety

Sephiroth_dude · 20-12-2017 1:51pm

Anima wrote: »

Visual Studio and Java?

Java doesn't have static classes like that I don't think. I also don't know why those classes would be made static anyway.

Just too clarify, I'm using eclipse for java and visual studio for c#.

Finding smaller number of 2 numbers inputted by user

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