vb做！！急急急急
2个回答
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左图：
Dim n As Integer
n = Val(InputBox("输入一个不大于50的正整数！"))
Dim i As Integer
Dim j As Integer
Me.Cls
For i = 1 To n
For j = 1 To i
Print "*";
Next j
For j = 1 To 2 * (n - i)
Print " ";
Next j
For j = 1 To i
Print "*";
Next j
Print
Next i
右图：
Dim n As Integer
n = Val(InputBox("输入一个不大于50的正整数！"))
Dim i As Integer
Dim j As Integer
Me.Cls
For i = 1 To n
For j = 1 To i
Print "* ";
Next j
For j = 1 To 2 * (n - i)
Print " ";
Next j
For j = 1 To i
Print "* ";
Next j
Print
Next i
Dim n As Integer
n = Val(InputBox("输入一个不大于50的正整数！"))
Dim i As Integer
Dim j As Integer
Me.Cls
For i = 1 To n
For j = 1 To i
Print "*";
Next j
For j = 1 To 2 * (n - i)
Print " ";
Next j
For j = 1 To i
Print "*";
Next j
Next i
右图：
Dim n As Integer
n = Val(InputBox("输入一个不大于50的正整数！"))
Dim i As Integer
Dim j As Integer
Me.Cls
For i = 1 To n
For j = 1 To i
Print "* ";
Next j
For j = 1 To 2 * (n - i)
Print " ";
Next j
For j = 1 To i
Print "* ";
Next j
Next i
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