vb简易计算器实验报告.doc

简易计算器课程设计报告一、实验目的： 模拟计算器的功能。系统启动后，先清屏，再在显示屏右侧显示0字样，系统仅接收数字键、加减乘除键、退格键、C键(复位)、=或回车键、ESC键(退出系统)作为有效按键，其余按键不响应。按键后屏幕显示效果要达到一般计算器显示屏的同样效果。不要求设计一般计算器上都具有的M功能。二、实验设计内容及思想：首先，创建一个主体框架：建立程序的主要界面后，系统自动生成界面的主要窗口生成代码。对于每个按钮的的代码段中，分别添加事件触发的处理代码。分别设立三个显示屏，第一个显示屏作为“被加数”框，第二个显示屏作为“加数”框，第三个显示屏则作为输出框。四则运算时直接采用计算表达式。所以，优先级和运算规则皆宜考虑在内。在进行除法运算时，若遇到除数为0，则运用条件语句执行，并在输出显示屏上输出“E”。三角函数、指数、对数、整除、取余等运算，也是运用类似手法。 考虑到计算器的操作简便性，所以加入了复位和退出按钮。三、源程序文件：Private Sub Command1_Click()Dim x As IntegerDim y As Integerx = Text1.Texty = Text2.TextText3.Text = x + yEnd SubPrivate Sub Command10_Click()Dim x As Integerx = Text1.TextText3.Text = Cos(x)End SubPrivate Sub Command11_Click()Dim x As Integerx = Text1.TextText3.Text = Tan(x)End SubPrivate Sub Command12_Click()Dim x As Integerx = Text1.TextText3.Text = Atn(x)End SubPrivate Sub Command13_Click()Dim x As IntegerDim y As Integerx = Text1.Texty = Text2.TextText3.Text = x yEnd SubPrivate Sub Command14_Click()Dim x As Integerx = Text1.TextIf x = 0 ThenText3.Text = 输入错误ElseText3.Text = Log(x)End IfEnd SubPrivate Sub Command15_Click()Text3.Text = 此按钮仅作装饰用End SubPrivate Sub Command2_Click()Dim x As IntegerDim y As Integerx = Text1.Texty = Text2.TextText3.Text = x - yEnd SubPrivate Sub Command3_Click()Dim x As IntegerDim y As Integerx = Text1.Texty = Text2.TextText3.Text = x * yEnd SubPrivate Sub Command4_Click()Dim x As IntegerDim y As Integerx = Text1.Texty = Text2.TextIf y = 0 ThenText3.Text = EElseText3.Text = x / yEnd IfEnd SubPrivate Sub Command5_Click()Dim x As IntegerDim y As Integerx = Text1.Texty = Text2.TextText3.Text = x yEnd SubPrivate Sub Command6_Click()Dim x As IntegerDim y As Integerx = Text1.Texty = Text2.TextText3.Text = x Mod yEnd SubPrivate Sub Command7_Click()Text1.Text = Text2.Text = Text3.Text = 0End SubPrivate Sub Command8_Click()EndEnd SubPrivate Sub Command9_Click()Dim x As Int