Private Sub Command1_Click()
    'PROGRAM D5R8
    'Driver for routine CHEBPC
    NVAL = 40
    PIO2 = 1.5707963
    Dim C(40), D(40)
    A = -PIO2
    B = PIO2
    Call CHEBFT(A, B, C(), NVAL)
    Print
    Print Tab(5); "How many terms in Chebyshev evaluation?"
    'Input MVAL , between 6 and 40, MVAL=0 TO END
    MVAL = 20
    Print Tab(5); MVAL
    If (MVAL <= 0) Or (MVAL > NVAL) Then Exit Sub
    Call CHEBPC(C(), D(), MVAL)
    'Test polynomial
    Print Tab(5); "    X          Actual      Polynomial"
    For I = -8 To 8 Step 1
        X = I * PIO2 / 10#
        Y = (X - (0.5 * (B + A))) / (0.5 * (B - A))
        POLY = D(MVAL)
        For J = MVAL - 1 To 1 Step -1
            POLY = POLY * Y + D(J)
        Next J
        Print Tab(5); Format$(X, "#0.000000");
        Print Tab(19); Format$(FUNC(X), "#0.000000");
        Print Tab(33); Format$(POLY, "#0.000000")
    Next I
End Sub
Function FUNC(X)
    FUNC = (X ^ 2) * (X ^ 2 - 2#) * Sin(X)
End Function