C# - methods - How to Create a console-based program?

lovlly bersbe

12y1.8kVisual Basic .NET

How to Create a console-based program whose Main() method

holds two integer variables. Assign values to the variables.

Within the class, create two methods, Sum() and

Difference(), that compute the sum of and difference

between the values of the two variables, respectively. Each

method should perform the computation and display

the results. In turn, call each of the two methods from

Main(), passing the values of the two integer variables.?

6 Replies

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Vulpes12y ago
Accepted answer
Try:

using System;

class Program
{
static void Main()
{
int x, y;
Console.Write("Enter value of x : ");
x = int.Parse(Console.ReadLine());
Console.Write("Enter value of y : ");
y = int.Parse(Console.ReadLine());
Sum(x, y);
Difference(x, y);
Console.ReadKey();
}

static void Sum(int x, int y)
{
Console.WriteLine("x + y = {0}", x + y);

}

static void Difference(int x, int y)
{
Console.WriteLine("x - y = {0}", x - y);
}
}
Wim Sturkenboom12y ago
Hints to validate user input:
look at Int32.TryParse() and at try/catch
Wim Sturkenboom12y ago
Assuming you're using a IDE like visual studio to create your GUI:

Create a gui app, drag three textboxes on to it. Drag a couple of buttons. Give the textboxes and buttons sensible names. For the textbox that holds the result, e.g. tbResult, for a button to add tbAdd. Add an event handler to each button; in VS, simply double click the button.

I did not see a requirement for a static class so the class for the calculations (called Numbers) could be like this:

    public class Numbers
    {
        int ii;
        int jj;

        public Numbers(int num1, int num2)
        {
            ii = num1;
            jj = num2;

        }

        public int Add()
        {
            return ii + jj;
        }
    }

You can add methods for multiply etc

Your btnAdd event handler

        private void btnAdd_Click(object sender, EventArgs e)
        {
            int x = Convert.ToInt32(textBox1.Text);
            int y = Convert.ToInt32(textBox2.Text);

            Numbers newnumbers = new Numbers(x, y);
            int z = newnumbers.Add();

            tbResult.Text = z.ToString();
        }

First you need to instantiate the numbers class with two numbers (coming from textBox1 and textBox2). Next you can cal the method to do the work and in the last step you place the result in tbResult.

You can figure out the other ones yourself.

Note: there is no checking if the user actually types numbers; if a user types a letter and click the button, it will crash. For you to figure out how to prevent that ;)
lovlly bersbe12y ago
Create a GUI application that contains the methods
described in the two question above . When the user
clicks a button, display the results.
Vulpes12y ago
I've altered the code to do that:

using System;

class Numbers
{
static void Main()
{
int x, y;
Console.Write("Enter value of x : ");
x = int.Parse(Console.ReadLine());
Console.Write("Enter value of y : ");
y = int.Parse(Console.ReadLine());
Sum(x, y);
Difference(x, y);
int z = Product(x, y);
Console.WriteLine("x * y = {0}", z);
Console.ReadKey();
}

static void Sum(int x, int y)
{
Console.WriteLine("x + y = {0}", x + y);

}

static void Difference(int x, int y)
{
Console.WriteLine("x - y = {0}", x - y);
}

static int Product(int x, int y)
{
return x * y;
}
}
lovlly bersbe12y ago
In addition to the question above, how to Add a method named Product() to the Numbers class.
This method should compute the multiplication product of
two integers, but not display the answer. Instead, it should
return the answer to the calling Main() method, which displays
the answer.tHaNKS