用VB编写程序，找出所有小于或等于100的自然数对。
public class A {
/**
* @param args
*/
public static void main(String[] args) {
for(int i = 50;i < 100; i++){
boolean isPrime = true;
for(int j = 2; j <= Math.sqrt(i); j++){
if(i % j == 0){
isPrime = false;
break;
}
}
if(isPrime){
System.out.print(i + ", ");
}
}
}
}
-----------testing
53, 59, 61, 67, 71, 73, 79, 83, 89, 97,
Private Sub Form_Activate()
Dim i%, j%, x%, y%
For i = 1 To 100
For j = 1 To i
x = i + j
y = i - j
If y > 0 Then
If Sqr(x) = Int(Sqr(x)) And Sqr(y) = Int(Sqr(y)) Then
Print i, j
End If
End If
Next j
Next i
End Sub
Private Sub Command1_Click()
For i = 1 To 99
For j = i + 1 To 100
t1 = Round(Sqr(i + j))
t2 = Round(Sqr(j - i))
If t1 * t1 = i + j And t2 * t2 = j - i Then Print "(" & i; ","; j; ")": n = n + 1
Next
Next
Print "N="; n
End Sub
把Text1文本框控件的MultyLine属性设置为True，再把
If t1 * t1 = i + j And t2 * t2 = j - i Then Print "(" & i; ","; j; ")": n = n + 1
改为：
If t1 * t1 = i + j And t2 * t2 = j - i Then
Text1 = Text1 & "(" & i & "," & j & ")" & VbCrlf
n = n + 1
End If
0也是自然数
Private Sub Command1_Click()
Dim i As Integer, j As Integer
For i = 0 To 100
For j = i + 1 To 100
If Int(Sqr(i + j)) ^ 2 = i + j And _
Int(Sqr(Abs(i - j))) ^ 2 = Abs(i - j) Then
Text1.Text = Text1.Text & i & " " & j & vbCrLf
End If
Next
Next
End Sub
Private Sub Form_Load()
'Text1的属性MultiLine设置为True
'Text1的属性ScrollBars设置为 2
Text1.Text = ""
End Sub
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