C # calculator program, supporting brackets, the decimal point. Mainly improve the brackets and the decimal point, arithmetic problems, for your reference. Also refer to the online some methods, thanked here. Writing is not good, please comment.
To:
Private void Button13_Click (object sender, EventArgs e)
{
//subtraction
If (txtBox1. Text=="")
{
MessageBox. Show (" There must be one numerator ");
}
The else
{
S3=input. The Substring (input. The Length - 1, 1);
If (Judge & amp; & S3!=". ")//(k==1)
SymbolInput (' - ');
ShowMessage ();
Judge=false;//k +=1;
Dotjudge=true;
Num=1;
}
}

Private void Button14_Click (object sender, EventArgs e)
{
//the multiplication;
If (txtBox1. Text=="")
{
MessageBox. Show (" There must be one numerator ");
}
The else
{
S3=input. The Substring (input. The Length - 1, 1);
If (Judge & amp; & (s3!=""))//(k==1)
SymbolInput (' * ');
ShowMessage ();
Judge=false;
Dotjudge=true;

Num=1;
}
}

Private void Button15_Click (object sender, EventArgs e)
{
//division;
If (txtBox1. Text=="")
{
MessageBox. Show (" There must be one numerator ");
}
The else
{
S3=input. The Substring (input. The Length - 1, 1);
If (Judge & amp; & S3!=". ")//(k==1)
SymbolInput ('/');
ShowMessage ();
Judge=false;
Dotjudge=true;
Num=1;
}

}

Private void Button17_Click (object sender, EventArgs e)
{
//to empty;
Input="";
TxtBox1. Text="";
ShowMessage ();
TxtBox1. ReadOnly=false;
TxtBox2. Text="";
Num=1;
}

Private void Button18_Click (object sender, EventArgs e)
{
//backspace
If (input Length & gt; 0)
{txtBox1. Text=input. The Substring (0, input. The Length - 1); }
The else
{txtBox1. Text=""; }
Input=txtBox1. Text;
Num=1;

}

Private void Button19_Click (object sender, EventArgs e)
{
//left parenthesis;
Judge=true;
LeftBracketInput (' (');
ShowMessage ();
}

Private void Button20_Click (object sender, EventArgs e)
{
//right parenthesis;
If (txtBox1 Text!="")
{
Judge=true;
RightBracketInput ('));
ShowMessage ();
}
}

Private void Calculator_Load (object sender, EventArgs e)
{
TxtBox1. Focus ();
TxtBox1. TabIndex=0;
}

Private void Button16_Click (object sender, EventArgs e)
{
MSScriptControl. IScriptControl sc=new MSScriptControl. ScriptControlClass ();
Sc. Language="javascript";
String s;
S=txtBox1. Text;

Try
{
TxtBox2. Text=sc. Eval (s). The ToString ();
}
The catch (Exception)
{
MessageBox. Show (" Wrong Expression Input!" );
TxtBox1. Focus ();
TxtBox1. TabIndex=0;
}

}
}
}

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