# Fahrenheit To Celsius in VB.NET

May 20, 2021

Problem

Write a program to ask the user to give temperature in Fahrenheit and then the program will convert the given temperature into Celsius equivalent.

Formula to convert Fahrenheit to Celsius below

°C = (°F  –  32)  x  5/9

Example

50°F = 10°C ( (50°F – 32) multiplied by 5/9 = 10°C )

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Program Listing

``````' Fahrenheit To Celsius in VB.NET
' Prof. Jake Rodriguez Pomperada, MAED-IT, MIT
' Bacolod City, Negros Occidental Philippines
' May 17, 2021   Monday  3:56 PM

Public Class Form1

Shared Function ConvertF2C(f As Double) As Double
Return (f - 32) * 5 / 9
End Function

Private Sub btnConvert_Click(sender As Object, e As EventArgs) Handles btnConvert.Click

Dim temperature As Double
Dim result As Double

temperature = Val(txtFahrenheit.Text)
If txtFahrenheit.Text = "" Or IsNumeric(txtFahrenheit.Text) = False Then
MessageBox.Show("Please enter temperature in Fahrenheit.", "Reminder", MessageBoxButtons.OK, MessageBoxIcon.Question)
txtFahrenheit.Text = ""
txtFahrenheit.Focus()
Else
result = ConvertF2C(temperature)
txtCelsius.Text = result.ToString("#####.##") & "°C"
End If
End Sub

Private Sub btnClear_Click(sender As Object, e As EventArgs) Handles btnClear.Click
txtFahrenheit.Text = ""
txtCelsius.Text = ""
txtFahrenheit.Focus()
End Sub

Private Sub btnQuit_Click(sender As Object, e As EventArgs) Handles btnQuit.Click
Dim result = MessageBox.Show(" Are you sure you want to quit the program?", "Confirmation", MessageBoxButtons.YesNo, MessageBoxIcon.Question)
If result = DialogResult.Yes Then
Me.Close()
Else
Me.Show()
txtFahrenheit.Text = ""
txtCelsius.Text = ""
txtFahrenheit.Focus()
End If
End Sub
End Class
``````