判断吧，如果点击+按肢链钮，则一个全局变量为1，-按钮，则全闹陵局变量为2.以此类推，历弯孙然后if或case判断哪个数，如果为1，就两个数相加。
成都创新互联公司是一家集网站建设,师宗企业网站建设,师宗品牌网站建设,网站定制,师宗网站建设报价,网络营销,网络优化,师宗网站推广为一体的创新建站企业，帮助传统企业提升企业形象加强企业竞争力。可充分满足这一群体相比中小企业更为丰富、高端、多元的互联网需求。同时我们时刻保持专业、时尚、前沿，时刻以成就客户成长自我，坚持不断学习、思考、沉淀、净化自己，让我们为更多的企业打造出实用型网站。
我用VB做的你看能不能用
Public b
Public c
Public d
Public e
Public f
Private Sub Command14_Click()
d = ""
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Exit Sub
'c = Text1.Text
If b = "" Then Exit Sub
If e = "+" Then
d = f + b
Else
If e = "-" Then
d = f - b
Else
If e = "*" Then
d = f * b
Else
If e = "/" Then
If b = 0 Then
MsgBox "被除数不能为零！"
Exit Sub
End If
d = f / b
Else
MsgBox "错误操作！"
End If
End If
End If
End If
Text1.Text = d
b = ""
c = ""
e = ""
End Sub
Private Sub Command15_Click()
Text1.Text = ""
b = ""
c = ""
d = ""
e = ""
f = ""
End Sub
Private Sub Form_Load()
Text1.Text = ""
End Sub
Private Sub Command1_Click()
'判断开头有运算符就清零
If Text1.Text = "握戚+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
'判断开头有0就禁止输入数字
If Text1.Text = "0" Then
Else
a = 1
'发现运算结果就清零
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text '得到当前操作数
End Sub
Private Sub Command2_Click()
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
If Text1.Text = "0" Then
Else
a = 2
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text
End Sub
Private Sub Command3_Click()
If Text1.Text = "+" Or Text1.Text = "帆皮局-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
If Text1.Text = "0" Then
Else
a = 3
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text
End Sub
Private Sub Command4_Click()
If Text1.Text = "态让+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
If Text1.Text = "0" Then
Else
a = 4
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text
End Sub
Private Sub Command5_Click()
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
If Text1.Text = "0" Then
Else
a = 5
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text
End Sub
Private Sub Command6_Click()
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
If Text1.Text = "0" Then
Else
a = 6
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text
End Sub
Private Sub Command7_Click()
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
If Text1.Text = "0" Then
Else
a = 7
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text
End Sub
Private Sub Command8_Click()
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
If Text1.Text = "0" Then
Else
a = 8
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text
End Sub
Private Sub Command9_Click()
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
If Text1.Text = "0" Then
Else
a = 9
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
End If
b = Text1.Text
End Sub
Private Sub Command10_Click()
If b = "" Then Exit Sub
a = "+"
e = "+"
f = b
Text1.Text = ""
Text1.Text = Text1.Text a
End Sub
Private Sub Command11_Click()
If b = "" Then Exit Sub
f = b
a = "-"
e = "-"
Text1.Text = ""
Text1.Text = Text1.Text a
End Sub
Private Sub Command12_Click()
If b = "" Then Exit Sub
a = "*"
e = "*"
f = b
Text1.Text = ""
Text1.Text = Text1.Text a
End Sub
Private Sub Command13_Click()
If b = "" Then Exit Sub
a = "/"
e = "/"
f = b '把操作数1提取出来
Text1.Text = ""
Text1.Text = Text1.Text a
End Sub
Private Sub Command16_Click()
'判断有运算符就清零
If Text1.Text = "+" Or Text1.Text = "-" Or Text1.Text = "*" Or Text1.Text = "/" Then Text1.Text = ""
'判断有零和空值就禁止输入0
'发现运算结果就清零
If d "" Then Text1.Text = "": d = ""
If Text1.Text = "0" Then
Else
a = 0
If d "" Then Text1.Text = "": d = ""
Text1.Text = Text1.Text a
b = Text1.Text
End If
End Sub
不知道你想要哪种，偶是新手，只会最简单的
首先拖出三个text，再拖出4个Command按钮 caption分别为+ - * / 这样就准备就绪了
先讲一下简单用法，第一纤森个text是第一个加数/被减数虚竖悔/因数/被除数，而第二个text是第二个加数/减数/因数/除数，第三个text是和/差/积/商，在text1输入一个数，text2输入一个，然后分别点击command“+ - * /”text3就差正会出现结果
然后随便单击一个窗口，把里面的文字删去，再写上：
Private Sub Command1_Click()
Text3.Text = Str$(Val(Text1.Text) + Val(Text2.Text))
End Sub
Private Sub Command2_Click()
Text3.Text = Str$(Val(Text1.Text) - Val(Text2.Text))
End Sub
Private Sub Command3_Click()
Text3.Text = Str$(Val(Text1.Text) * Val(Text2.Text))
End Sub
Private Sub Command4_Click()
Text3.Text = Str$(Val(Text1.Text) / Val(Text2.Text))
End Sub
然后运行，应该就可以了
在窗体上添加一个Text1控件, 用于输入电费单价；再添加一个Text2控件，用于输入渣局闹电量；再添加一个Text3, 用于输出计算结果；最后添加一个Command1按钮如罩。代码腊败如下：
Private Sub Command1_Click()
Text3.Text = Val(Text1.Text) * Val(Text2.Text)
End Sub