Question

how to add methods into thjs code using C# on visual studio?

-validatetextbox should return a true false depending if input is valid

-resetinput should clear all input and restart radiobuttons to the defult positions

-displaymessge must display messge box to the user displaying such as “5+8=12”

calculator.cs x Prearam S Miscellaneous Files ator.Designer.c s Calculato 1 曰using Systemi 2 using System.Collections.Generic; using System.ComponentModel; 4 using System.Data; s using System.Drawing; 6 using System.Linq 7using System.Text; 8 using System.Threading.Tasks; 9 using System.Windows.Forms 18 11 日namespace Calculator 12 13 public partial class calculator: Form 14 15 16 E 17 18 19 28 21 public calculator) InitializeComponent ) //Set the default focus to the first Textbox firstNumInput.Focus) 23 24 E 25 26 private void calculateButton Click(object sender, EventArgs e) //Variables to be used double firstNumber; double secondNumber 28 29 double total; 31 //Get and Validate first number if (Idouble.TryParse(firstluminput.Text, out firstNumber)) 32 E //Display Error to user Messageßox. Show("Please insert a valid number.") 35 36 37 38 39 //Switches focus to first textbox firstNumInput.FocusO //Exit out of method return; //Get and Validate second number if (Idouble.TryParse(secondNumInput.Text, out secondNumber)) 45曰 46 //Display Error to user MessageBox. Show("Please insert a valid number.") //Switches focus to second textbox secondNumInput. Focus); //Exit out of method returnj 48 51 52 53 rosoft Visual Studi oject Debug Team Tools Test Analyce Window Help Attach calculater.Designerc //Exit out of method return; //Get Options and Calculate // Addition (+ ) if (addition.Checked) //Calc total total firstNumber+ secondNumber: //Display MessageBox with the result MessageBox.Show( "Your total isnfirstNumber+secondNumbertotal)i //Reset the focus to the first textbox firstNumInput.Focus) //Reset Input firstNuminput.Text secondNumInput.Text // Subtraction) if (subtraction.Checked) //Calculate Total total firstNumber - secondNumber; //Display MessageBox with the result MessageBox . Shon("Your total is : Vn. + firsthuber + " . " + secondumber + “ -" + total); //Reset the focus to the first textbox firstNumInput.FocusO //Reset Input firstNumInput.Text secondnuninput.Text .."; /ISwitches radiobuttons to default addition.Checked-true // Mulitplication() if (multiplication.Checked) //Calculate Total total firstNumber secondNumber; //Display MessageBox with the result MessageBox, Show("Your total is n" firstNumberecondiumber+ total): //Reset the focus to the first textbox 0-24 culatores-Microsoft Visual Studio dia View Project Debug Team Tools Test Ansyce Window Help ellaneous Files Caculator.calculator HessageBox.Show Your total is : n firstNumbersecondilumber total)i //Reset the focus to the first textbox firstNumInput.Focus) //Reset Input firstNumInput.Text secondNuminput.Text //Switch radiobuttons to default addition.Checked true // Division ) if (division.Checked) //Second number should not be zero //Display error to user Messagebox.Show"Cannot divide by zero." //Switch focus to invalid TextBox secondMrInput·Focus(); //Exit out of nethod 6 //Calculate Total total firstNumber / secondNumber 32 3 //Display MessageBox with the result MessageBox. Show"Your total is : InfirstNumbersecondlumber+total); 6 8 เอ $2 //Reset the focus to the first textbox firstiumInput.Focus)i / /Reset Input firstNumInput.Text secondliumInput. Text //Switch radiobuttons to default addition.Checked-true //Modulus (%) if (modulus,Checked) //Calculate Total total . firstu ber % secondiueber; //Display MessageBox with the result MessageBox. Show "Your total isnfirstlurber nod+ secondlusber"+total) 24 tor.cs Microsoft Visual Studio View Project Debug Team Tools Test Analyze Window Help Attach. calculator Designer.c ous Files Calculator.calculator //Display MessageBox with the result HessageBox.Show( "your total is : In+ firstumber +mod secondlumber+total): //Reset the focus to the first textbox firstNuminput.Focus(); //Reset Input firstNumInput. Text secondNumInput. Text //Switch radiobuttons to default addition.Checked true // Power ( Pow) // Reset: Click Resets the input private void reset Click(object sender, EventArgs e) //Reset the focus to the first textbox firstNuminput.Focus) //Reset input firstNumInput.Text secondNumInput. Text //Switch radiobuttons to default addition.Checked true; // Close: Click - Closes the progran private void close_click(object sender, Eventangs e) this.Close)i

Answer 1

Below is the solution:

using System;
using System.Windows.Forms;

namespace Calculator2
{
    public partial class Calculator : Form
    {
        public Calculator()
        {
            InitializeComponent();
        }

        private void Calculator_Load(object sender, EventArgs e)
        {
            firstNumInput.Focus();
        }

        private void calculateButton_Click(object sender, EventArgs e)
        {
            double firstNumber;
            double secondNumber;
            double total;

            if(isValidate(firstNumInput.Text)){
                MessageBox.Show("Input first Number correct");
                firstNumInput.Focus();
            }
            else if (isValidate(secondNumInput.Text))
            {
                MessageBox.Show("Input second Number correct");
                secondNumInput .Focus();
            }
            else
            {

                firstNumber = Convert.ToDouble(firstNumInput.Text);
                secondNumber = Convert.ToDouble(secondNumInput.Text);
                if (addition.Checked)
                {
                    total = firstNumber + secondNumber;
                    MessageBox.Show("Your total is: \n"+firstNumber + "+"+secondNumber+ "="+ total.ToString());
                    firstNumInput.Text = ""; //clear the textbox
                    secondNumInput.Text = ""; //clear the textbox
                    firstNumInput.Focus(); //focus the textbox
                }
                else if (subtraction.Checked)
                {
                    total = firstNumber - secondNumber;
                    MessageBox.Show("Your total is: \n" + firstNumber + "-" + secondNumber + "=" + total.ToString());
                    firstNumInput.Text = ""; //clear the textbox
                    secondNumInput.Text = ""; //clear the textbox
                    firstNumInput.Focus(); //focus the textbox
                    addition.Checked = true; //set the default radio button addition to checked
                }
                else if (multiplication.Checked)
                {
                    total = firstNumber * secondNumber;
                    MessageBox.Show("Your total is: \n" + firstNumber + "*" + secondNumber + "=" + total.ToString());
                    firstNumInput.Text = ""; //clear the textbox
                    secondNumInput.Text = ""; //clear the textbox
                    firstNumInput.Focus(); //focus the textbox
                    addition.Checked = true; //set the default radio button addition to checked
                }

                else if (division.Checked)
                {
                    if (secondNumber == 0) //check for the second number is not zero
                    {
                        MessageBox.Show("Cannot divided by zero");
                        secondNumInput.Focus(); //focus the textbox
                        return;
                    }
                    total = firstNumber / secondNumber;
                    MessageBox.Show("Your total is: \n" + firstNumber + "/" + secondNumber + "=" + total.ToString());
                    firstNumInput.Text = ""; //clear the textbox
                    secondNumInput.Text = ""; //clear the textbox
                    firstNumInput.Focus(); //focus the textbox
                    addition.Checked = true; //set the default radio button addition to checked
                }
                else if (modulus .Checked)
                {
                    total = firstNumber % secondNumber;
                    MessageBox.Show("Your total is: \n" + firstNumber + "%" + secondNumber + "=" + total.ToString());
                    firstNumInput.Text = ""; //clear the textbox
                    secondNumInput.Text = ""; //clear the textbox
                    firstNumInput.Focus(); //focus the textbox
                    addition.Checked = true; //set the default radio button addition to checked
                }
            }
        }

        //function to validate the input box
        private bool isValidate(string num) //validate the input number
        {
            double number;
            if (!double.TryParse(num, out number)) //check for the inputis number
                return true; //return true
            else
                return false; //return false if not number
        }

        private void close_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void reset_Click(object sender, EventArgs e)
        {
            firstNumInput.Text = "";
            secondNumInput.Text = "";

            firstNumInput.Focus(); //focus on first input box
            addition.Checked= true; //set the default radio button addition to checked

        }
    }
}

output:

Calculator First Number Second Number: Your total is: 2+4-6 0 Add O Subtract ° Multiply ° Divide ° Modulus OK Calculate Reset