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仅仅是普通表达式的话,定义数据类型,比如从单精度改为双精度,如果想保留小数点位数,用formatnumber来处理。如果是某个算法的精度,就要复杂一些,要定义一个误差,在算法迭代过程中,用while语句判断计算结果的残差是否小于定义的误差值,至于残差如何计算,与你的算法有关
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运用多线程技术把一个任务分配到几个线程上让它们同时处理,这样会比单线程快很多,不过多线程技术不是一两话能说清的,你可以查一下相关的资料.
窗体上放一个command和两个label,点击按钮就可以看到鼠标按下和释放的时间:
Private Declare Sub GetSystemTime Lib "kernel32" (lpSystemTime As SYSTEMTIME)
Private Type SYSTEMTIME
wYear As Integer
wMonth As Integer
wDayOfWeek As Integer
wDay As Integer
wHour As Integer
wMinute As Integer
wSecond As Integer
wMilliseconds As Integer
End Type
Private Sub Command1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
Dim a As SYSTEMTIME
GetSystemTime a
With a
' Label1 = .wHour ":" .wMinute ":" .wSecond ":" Format(.wMilliseconds / 1000, "0.0")
Label1 = .wHour ":" .wMinute ":" .wSecond ":" .wMilliseconds
End With
End Sub
Private Sub Command1_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single)
Dim a As SYSTEMTIME
GetSystemTime a
With a
Label2 = .wHour ":" .wMinute ":" .wSecond ":" .wMilliseconds
End With
End Sub