Question

C#

I am having trouble this program. So far my temperature converter program is converting temps from C to F. However, whenever I try to convert F to C, it's keep crashing and displaying an error message, which I can not figure it out and do not know how to fix it. Attached are two screenshots are of message. Do you know what is causing the issue? I would much appreciate your assistance.

namespace Temp Conv
{
public partial class Form1 : Form
{
double celsius;
double fahrenheit;

public Form1()
{
InitializeComponent();
}
public void ToCelsius(double fah)
{

celsius = (fah - 32) * (9 / 5);
celsiusTextBox.Text = celsius.ToString();
}

public void ToFahrenheit(double cel)
{

fahrenheit = (cel * (9 / 5)) + 32;
fahrenheitTextBox.Text = fahrenheit.ToString();
}

private void convertButton_Click(object sender, EventArgs e)
{
if (celsiusTextBox.Focus())
{
celsius = Convert.ToDouble(celsiusTextBox.Text);
ToFahrenheit(celsius);
}

if (fahrenheitTextBox.Focus())
{
fahrenheit = Convert.ToDouble(fahrenheitTextBox.Text);
ToCelsius(fahrenheit);
}
  
}

private void clearButton_Click(object sender, EventArgs e)
{
celsiusTextBox.Text = "";
fahrenheitTextBox.Text = "";
}

private void exitButton_Click(object sender, EventArgs e)
{
// Close the form.
this.Close();
}
}
}

37 38 39 40 41 42 fahrenheit-(cel * (9 / 5)) + 32; fahrenheitTextBox.Text - fahrenheit. ToString(); private void fahrenheitTextBox_TextChanged(object sender, EventArgs e) 45 46 47 48 49 50 51 52 53 54 private void convertButton_Click(object sender, EventArgs e) | if (celsiusTextBox. Focus( celsius Convert.ToDouble(celsiusTextBox.Text); toFahrenheit(celsius) 피x Exception Unhandled System.FormatException: 'Input string was not in a correct format. 56 57 58 59 60 61 62 63 64 65 View Details Copy Details > Exception Settings private void Form1_Load (object sender, EventArgs e)

Answer 1

Dear Student ,

As per the requirement submitted above , kindly find the below solution.

Here a new windows forms application in C# is created using visual studio 2017 with name "TempConversion".This application contains a form with name "Form1.cs".Below are the files associated with this form.

1.Form1.cs[Design]

Temprature Converter Temprature Converter Enter the value of the temprature that you want to convert next to its type and press Celsius Fahrenheit Convert Clear Exit

2.Form1.Designer.cs

3.Form1.cs

//namespace
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
//application namespace
namespace TempConversion
{
public partial class Form1 : Form
{
//declaring variables
double celsius;
double fahrenheit;
int flag;
public Form1()
{
InitializeComponent();
}
//method to convert from fahrenheit to celsius
public void ToCelsius(double fah)
{
//convert to celsius
celsius = (fah - 32) * 5 / 9;
//display celsius temp in the textbox
celsiusTextBox.Text = celsius.ToString("N2");
}
//method to convert from celsius to fahrenheit
public void ToFahrenheit(double cel)
{
//convert to fahrenheit
fahrenheit = (cel * 9 / 5) + 32;
//display fahrenheit temp in the textbox
fahrenheitTextBox.Text = fahrenheit.ToString("N2");
}
//convert button click
private void convertButton_Click(object sender, EventArgs e)
{
//checking value of flag
if (flag == 1)
{
//take user entered celsius temprature and parse it to double
celsius = Convert.ToDouble(celsiusTextBox.Text);
//call method and pass temp in celsius
ToFahrenheit(celsius);
}
//if flag is zero then
else if (flag == 0)
{
//take user entered fahrenheit temprature and parse it to double
fahrenheit = Convert.ToDouble(fahrenheitTextBox.Text);
//call method and pass temp in fahrenheit
ToCelsius(fahrenheit);
}
}
//Clear button click
private void clearButton_Click(object sender, EventArgs e)
{
//When this button clicked clear textboxes
celsiusTextBox.Text = "";
fahrenheitTextBox.Text = "";
}
//Exit button click
private void exitButton_Click(object sender, EventArgs e)
{
// Close the form.
this.Close();
}
//handling enter evnet for textbox celsiusTextBox
private void celsiusTextBox_Enter(object sender, EventArgs e)
{
flag = 1; //setting value of flag
}
//handling enter evnet for textbox fahrenheitTextBox
private void fahrenheitTextBox_Enter(object sender, EventArgs e)
{
//setting value of flag
flag = 0;
}
}
}

======================================================

Output : Run application using F5 and will get the screen as shown below

Screen 1 :

Temprature Converter Temprature Converter Enter the value of the temprature that you want to convert next to its type and press Celsius Fahrenheit Convert Clear Exit

Screen 2 :Screen when temp is entered in fahrenheit TextBox

Screen 3 :Screen showing temp in celsius

(골 Temprature Converter Temprature Converter Enter the value of the temprature that you want to convert next to its type and press Celsius 44.44 Fahrenheit 112 Convert Llear Exit

Screen 4 :Screen showing temp in fahrenheit

Temprature Converter Temprature Converter Enter the value of the temprature that you want to convert next to its type and press Celsius 80 176.00 Fahrenheit Convert Clear Exit

Note :In case of both textbox Focus() event returns true hence getting error.

NOTE : PLEASE FEEL FREE TO PROVIDE FEEDBACK ABOUT THE SOLUTION.