This document contains code for two forms in Visual Basic. Form1 contains code to load different operation options into a combo box based on the login credentials passed from Form2. It also contains code to perform the selected operation on two numbers and display the result. Form2 contains code to set a login number based on the user entered and pass it to Form1, along with a button click event to trigger the login.

1. UNIVERSIDAD GERARDO
BARRIOS SAN MIGUEL
ALUMNO:
GERARDO STEVEN MEJIA
PERDOMO
ASIGNATURA :
PROGRAMACION
COMPUTACIONAL 1
INGENIERA:
GISELA ESPINOZA
CARRERA:
INGENERIA EN SISTEMAS
GRUPO:
A

2. EJERCICIO1
Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
ComboBox1.Items.Add("Suma")
ComboBox1.Items.Add("Resta")
ComboBox1.Items.Add("Division")
ComboBox1.Items.Add("Multiplicacion")
End Sub
Private Sub ComboBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles
ComboBox1.SelectedIndexChanged
Dim a As Double
Dim b As Double
Dim c As Double
Dim operadores As String
a = TextBox1.Text
b = TextBox2.Text
c = 0
operadores = ComboBox1.Text
If operadores = "Suma" Then
c = a + b
ElseIf operadores = "Resta" Then
c = a - b
ElseIf operadores = "Division" Then
c = a / b
ElseIf operadores = "Multiplicacion" Then
c = a * b
Else
MsgBox("No selecciono ninguna operacion")
End If
Label4.Text = c

3. EJERCICIO2
Formulario1
Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
If Form2.login = 1 Then
ComboBox1.Items.Add("Suma")
ComboBox1.Items.Add("Resta")
ComboBox1.Items.Add("Division")
ComboBox1.Items.Add("Multiplicacion")
Label6.Text = "ugb"
ElseIf Form2.login = 2 Then
ComboBox1.Items.Add("Resta")
ComboBox1.Items.Add("Division")
ComboBox1.Items.Add("Multiplicacion")
Label6.Text = "ugbSM"
ElseIf Form2.login = 3 Then
ComboBox1.Items.Add("Suma")
Label6.Text = "invitado"
End If
End Sub
Private Sub ComboBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles
ComboBox1.SelectedIndexChanged
Dim a As Double
Dim b As Double
Dim c As Double
Dim operadores As String
a = TextBox1.Text
b = TextBox2.Text
c = 0
operadores = ComboBox1.Text
If operadores = "Suma" Then
c = a + b
ElseIf operadores = "Resta" Then
c = a - b
ElseIf operadores = "Division" Then
c = a / b
ElseIf operadores = "Multiplicacion" Then
c = a * b
Else
MsgBox("No selecciono ninguna operacion")
End If
Label4.Text = c

4. End Sub
End Class
FORMULARIO 2
Public Class Form2
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
star(USER.Text)
End Sub
Private Sub Form2_Load(sender As Object, e As EventArgs) Handles MyBase.Load
End Sub
Public login As Integer
Public Function star(ByVal USER As String)
If USER = "ugb" Then
login = 1
Form1.Show()
ElseIf USER = "ugbSM" Then
login = 2
Form1.Show()
ElseIf USER = "invitado" Then
login = 3
Form1.Show()
End If
End Function
End Class