MATLAB：[1]纯代码实现简单计算器

1、 所有的代码如下，最后的界面如图所示：

%简单计算器

  hf=figure('Color',[0,1,1],'Position',[100,200,400,200],...

      'Name','简单计算器','NumberTitle','off','MenuBar','none');

   %文本1 用于输入数1

  ht1=uicontrol(hf,'Style','Text','Position',[0.1,0.8,0.2,0.1],...

      'Units','normalized','String','数1');

  %文本2 用于输入数2

  ht2=uicontrol(hf,'Style','Text','Position',[0.4,0.8,0.2,0.1],...

      'Units','normalized','String','数2');

  %文本3 用于输入数2

  ht3=uicontrol(hf,'Style','Text','Position',[0.7,0.8,0.2,0.1],...

      'Units','normalized','String','结果');

  %编辑框1 用于输入数1

  he1=uicontrol(hf,'Style','Edit','Position',[0.1,0.6,0.2,0.1],...

      'Units','normalized','Back',[0,1,0]);

  %编辑框2 用于输入数2

  he2=uicontrol(hf,'Style','Edit','Position',[0.4,0.6,0.2,0.1],...

      'Units','normalized','Back',[0,1,0]);

  %编辑框2 用于输入数2

  he3=uicontrol(hf,'Style','Edit','Position',[0.7,0.6,0.2,0.1],...

      'Units','normalized','Back',[0,1,0]);

   %下面这段代码用于实现数1加数2，并把结果显示到编辑框3

  ADD=['n1=str2num(get(he1,''String''));','n2=str2num(get(he2,''String''));',...

      'res=n1+n2;','set(he3,''string'',res);'];

   %下面这段代码用于实现数1减数2，并把结果显示到编辑框3

  SUB=['n1=str2num(get(he1,''String''));','n2=str2num(get(he2,''String''));',...

      'res=n1-n2;','set(he3,''string'',res);'];

   %下面这段代码用于实现数1乘数2，并把结果显示到编辑框3

  MUL=['n1=str2num(get(he1,''String''));','n2=str2num(get(he2,''String''));',...

      'res=n1*n2;','set(he3,''string'',res);'];

   %下面这段代码用于实现数1除数2，并把结果显示到编辑框3

  DIV=['n1=str2num(get(he1,''String''));','n2=str2num(get(he2,''String''));',...

      'res=n1/n2;','set(he3,''string'',res);'];

  %加法按钮

  uicontrol(hf,'Style','Push','Position',[0.1,0.3,0.2,0.12],...

       'String','+','Units','normalized','Call',ADD);

  %减法按钮

  uicontrol(hf,'Style','Push','Position',[0.3,0.3,0.2,0.12],...

       'String','-','Units','normalized','Call',SUB);

   %乘法按钮

  uicontrol(hf,'Style','Push','Position',[0.5,0.3,0.2,0.12],...

       'String','*','Units','normalized','Call',MUL);

  %除法按钮

  uicontrol(hf,'Style','Push','Position',[0.7,0.3,0.2,0.12],...

       'String','/','Units','normalized','Call',DIV);

2、静态文本的实现用了三行代码，用于显示文字数1、数2和结果：

  %文本1 用于输入数1

  ht1=uicontrol(hf,'Style','Text','Position',[0.1,0.8,0.2,0.1],...

      'Units','normalized','String','数1');

  %文本2 用于输入数2

  ht2=uicontrol(hf,'Style','Text','Position',[0.4,0.8,0.2,0.1],...

      'Units','normalized','String','数2');

  %文本3 用于输入数2

  ht3=uicontrol(hf,'Style','Text','Position',[0.7,0.8,0.2,0.1],...

      'Units','normalized','String','结果');

3、数1、数2和结果：用了编辑框来实现：

 he1=uicontrol(hf,'Style','Edit','Position',[0.1,0.6,0.2,0.1],...

      'Units','normalized','Back',[0,1,0]);

  %编辑框2 用于输入数2

  he2=uicontrol(hf,'Style','Edit','Position',[0.4,0.6,0.2,0.1],...

      'Units','normalized','Back',[0,1,0]);

  %编辑框2 用于输入数2

  he3=uicontrol(hf,'Style','Edit','Position',[0.7,0.6,0.2,0.1],...

      'Units','normalized','Back',[0,1,0]);

4、加减乘除的算法实现放在四个代码块中：

   %下面这段代码用于实现数1加数2，并把结果显示到编辑框3

  ADD=['n1=str2num(get(he1,''String''));','n2=str2num(get(he2,''String''));',...

      'res=n1+n2;','set(he3,''string'',res);'];

   %下面这段代码用于实现数1减数2，并把结果显示到编辑框3

  SUB=['n1=str2num(get(he1,''String''));','n2=str2num(get(he2,''String''));',...

      'res=n1-n2;','set(he3,''string'',res);'];

   %下面这段代码用于实现数1乘数2，并把结果显示到编辑框3

  MUL=['n1=str2num(get(he1,''String''));','n2=str2num(get(he2,''String''));',...

      'res=n1*n2;','set(he3,''string'',res);'];

   %下面这段代码用于实现数1除数2，并把结果显示到编辑框3

  DIV=['n1=str2num(get(he1,''String''));','n2=str2num(get(he2,''String''));',...

      'res=n1/n2;','set(he3,''string'',res);'];

5、下面的代码实现了四个按钮的显示和回调方法的设置：

  %加法按钮

  uicontrol(hf,'Style','Push','Position',[0.1,0.3,0.2,0.12],...

       'String','+','Units','normalized','Call',ADD);

  %减法按钮

  uicontrol(hf,'Style','Push','Position',[0.3,0.3,0.2,0.12],...

       'String','-','Units','normalized','Call',SUB);

   %乘法按钮

  uicontrol(hf,'Style','Push','Position',[0.5,0.3,0.2,0.12],...

       'String','*','Units','normalized','Call',MUL);

  %除法按钮

  uicontrol(hf,'Style','Push','Position',[0.7,0.3,0.2,0.12],...

       'String','/','Units','normalized','Call',DIV);

6、运算效果如图所示，所有功能正常。