d2r5.txt

常用的数值算法的VB程序

Private Sub Command1_Click()
    'PROGRAM D2R5
    'DRIVER for routine LOCATE
    N = 100
    Dim XX(100)
    'Create array to be searched
    For I = 1 To N
        XX(I) = Exp(I / 20#) - 74#
    Next I
    Print
    Print Tab(5); "Result of:    j=0 indicates x too small"
    Print Tab(5); "              j=100 indicates x too large"
    Print
    Print Tab(5); " locate       j           xx(j)           xx(j+1)"
    'For test
    For I = 1 To 19
        X = -100# + 200# * I / 20#
        Call LOCATE(XX(), N, X, J%)
        If J% = 0 Then
            Print Tab(5); Format$(X, "#0.0000");
            Print Tab(18); Format$(J%, "00");
            Print Tab(28); "lower lim";
            Print Tab(45); Format$(XX(J% + 1), "##.####00")
        ElseIf J% = N Then
            Print Tab(5); Format$(X, "#0.0000");
            Print Tab(18); Format$(J%, "00");
            Print Tab(28); Format$(XX(J%), "##.####00");
            Print Tab(45); "upper lim"
        Else
            Print Tab(5); Format$(X, "#0.0000");
            Print Tab(18); Format$(J%, "00");
            Print Tab(28); Format$(XX(J%), "##.####00");
            Print Tab(45); Format$(XX(J% + 1), "##.####00")
        End If
    Next I
End Sub