This code defines variables to store numeric values entered in text boxes, including both single and double precision variables. It then calculates the width (h) of trapezoidal integration between the first two x-values and uses the trapezoidal rule to calculate the integral of the y-values over that width, storing and displaying the results.

1. Private Sub CommandButton_Click()
Dim x1, x2, x3, x4, x5 As Single
Dim y1, y2, y3, y4, y5 As Double
Dim h, hasil_trapezoidal As Single
'Defenisi Variable
x1 = ekox1.Text
x2 = ekox2.Text
x3 = ekox3.Text
x4 = ekox4.Text
x5 = ekox5.Text
y1 = ekoy1.Text
y2 = ekoy2.Text
y3 = ekoy2.Text
y4 = ekoy2.Text
y5 = ekoy2.Text
'defenisi nilai h
h = x2 - x1
hasil_trapezoidal = h / 2 * (y1 + (2 * y2) + (2 * y3) + (2 * y4) + y5)
nilaih.Caption = h
hasiltrapezoidal.Caption = hasil_trapezoidal
End Sub