4 лабораторная код 1

Option Explicit On

Option Strict On

Imports System.Math

Public Class Form1

    'процедура-подпрограмма вычисляет z при 3-ом условии

    Sub usl_3(ByVal x1 As Single, ByVal y1 As Single, ByVal a1 As Single, ByRef z As Single)

        z = CSng(x1 + Sqrt(a1))

        vivod(z, TextBox4)

    End Sub

    'процедура-подпрограмма вычисляет min при 1-ом условии

    Sub usl_1(ByVal x1 As Single, ByVal y1 As Single, ByVal a1 As Single, ByRef z As Single)

        Dim min As Single

        min = a1 * x1

        If min > y1 Then

            min = y1

            If min > Sin(x1 * y1) Then

                min = CSng(Sin(x1 * y1))

            End If

        End If

        vivod(min, TextBox4)

    End Sub

    'процедура-подпрограмма вычисляет max при 3-ем условии

    Sub usl_2(ByVal x1 As Single, ByVal y1 As Single, ByVal a1 As Single, ByRef z As Single)

        Dim max As Single

        max = CSng(Exp(x1))

        If max < (x1 + a1 * y1) Then

            max = (x1 + a1 * y1)

        End If

        vivod(max, TextBox4)

    End Sub

    'процедура-подпрограмма выполянет вывод переменной в TextBox

    Sub vivod(ByVal W As Single, ByRef T As TextBox)

        T.Text = CStr(W)

    End Sub

    'процедура-Function выполняет ввод переменной в TextBox

    Function vvod(ByVal T As TextBox) As Single

        Return CSng(Val(T.Text))

    End Function

    '///////////////////////////////////////////////////////////////////

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

        Dim x As Single

        Dim y As Single

        Dim a As Single

        Dim z As Single

        x = vvod(TextBox1)

        y = vvod(TextBox2)

        a = vvod(TextBox3)

        If y > 2 And x > 0 Then

            usl_1(x, y, a, z)

            MsgBox("расчет прошел по условию Y>2 и X>0")

        ElseIf y <= 2 And x < 0 Then

            usl_2(x, y, a, z)

            MsgBox("расчет прошел по условию Y<=2 и X<0")

        Else

            usl_3(x, y, a, z)

            MsgBox("расчет прошел по условию в противном случае")

        End If

    End Sub

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click

        TextBox1.Clear()

        TextBox2.Clear()

        TextBox3.Clear()

        TextBox4.Clear()

    End Sub

    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click

        Application.Exit()

    End Sub

End Class