Question

用VB语句计算s=1+1/2!+1/3!+……+1/n!

考试急用。希望大家帮助。最好带注释。。

Answer 1

Private Sub Form_Click()
Form1.AutoRedraw = True
Cls '清屏
Dim n As Integer, Factorial As Double, s As Double
Factorial = 1 '赋初值，阶乘初值为1，若为0则阶乘结果永远是0
s = 0 '此处可省略，系统默认为0
n = Val(InputBox("Please enter “n”", "Tips")) '由用户输入n的值
For i = 1 To n
Factorial = Factorial * i '求阶乘
s = s + 1 / Factorial '求和
Print "n=" & i '此处3句是显示中间计算过程,可省略
Print "Factorial=" & Factorial
Print "S=" & s
Print '输出空行，将计算过程隔开，便于查看，可省略，也可加入符号，如：“Print "****************************"”
Next i
Print "最后结果：S=" & s
End Sub

Answer 2

楼上回答有误。应该有两个循环 ，也不用那么复杂
n=val(inputbox("请输入n值")) '获取n值
for i=1 to n
jc=1
for j=1 to i
jc=jc*j
next '此内层循环用来计算阶乘
s=s+1/jc '阶乘累加
next

Answer 3

1楼 的 方法很巧！

Answer 4

不好意思，刚才太匆忙，现在修改一下，应该是这样的吧：
dim i as integer,jc As Double, s As Double
n=val(inputbox("请输入n值")) '获取n值
jc = 1
s = 0
for i=1 to n
jc=jc*i '求n！
s=s+1/jc '1/n！累加
next