用vb编写 求20个元素的一维数组A，使用INPUTBOX函数赋值，输出最小元素的值及其下标

一楼有问题.
dim a(19) as double
for i=0 to 19
a(i)=inputbox("请输入一个数")
next
dim min1 as double '记录最小值
dim min2 as integer '记录下标
min1=a(0):min2=0 '要赋初值
for i = 1 to 19
if a(i) min1=a(i):min2=i
end if
next
print "最小数是：" & min1 & " 其下标是：" & min2

dim a(19) as double
for i=0 to 19
a(i)=inputbox("输入一个数")
next
dim zuixiaoshu as double
dim zuixiaoshuxiabiao as integer
for i = 0 to 19
if a(i)zuixiaoshu=a(i)
zuixiaoshuxiabiao=i
next
print "最小数是：" & zuixiaoshu & " 其下标是：" & zuixiaoshuxiabiao

Private Sub Command1_Click()
Dim a(5) As Single
For i = 0 To 5
a(i) = InputBox("请输入一个数：")
Next i
Dim Min As Single
Dim MinNum As Integer
Min = a(0)
For i = 0 To 5
If a(i) < Min Then
Min = a(i)
MinNum = i
End If
Next i
MsgBox "最小的数是：" & Min & " 下标是：" & MinNum
End Sub

dim a(1 to 20)
dim min as double
dim xiabiao as integer
private command1_click()
for i=1 to 20
a(i)=val(inputbox("输入一个数"))
next i
min=a(1):xiabiao=1
for i = 2 to 20
if a(i)min=a(i)
xiabiao=i
next i
print "最小数是：" ;min
print "其下标是：" ;xiabiao
end sub