[说明]
本程序求3～100之间的所有素数(质数)并统计个数；同时将这些素数从小到大依次写入顺序文件 E:\dataout.txt；素数的个数显示在窗体Form1上。
[Visual Basic 代码]
Private Sub Command1 Click ( )
Dim count as integer, flag as Boolean
Dim t1 as Integer, t2 as Integer
(1)
Count=0
For t1=3 to 100
(2)
For t2=2 to Int (Sqr (t1))
If (3) Then flag=False
Next t2
(4)
count=count +1
write #1, t1
End if
Next t1
(5)
Close #1
End Sub