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600612159 Lab1 #573

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6777bb8
update CalculatorEngine.cs
Pichchai Aug 24, 2018
fafaedb
ปุ่มเปอร์เซนทำงานอย่างไม่ถูกต้อง
Pichchai Sep 4, 2018
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5 changes: 4 additions & 1 deletion CPE200Lab1/CPE200Lab1/CPE200Lab1.csproj
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,7 @@
<Reference Include="System.Xml" />
</ItemGroup>
<ItemGroup>
<Compile Include="CalculatorEngine.cs" />
<Compile Include="MainForm.cs">
<SubType>Form</SubType>
</Compile>
Expand Down Expand Up @@ -76,7 +77,9 @@
</Compile>
</ItemGroup>
<ItemGroup>
<None Include="App.config" />
<None Include="App.config">
<SubType>Designer</SubType>
</None>
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
</Project>
225 changes: 225 additions & 0 deletions CPE200Lab1/CPE200Lab1/CalculatorEngine.cs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,225 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CPE200Lab1
{
class CalculatorEngine
{
private bool hasDot;
private bool isAllowBack;
private bool isAfterOperater;
private bool isAfterEqual;
private string firstOperand;
private string operate;
private string display = "0";

public string get_display()
{
return display;
}

public string calculate(string operate, string firstOperand, string secondOperand, int maxOutputSize = 8)
{
switch (operate)
{
case "+":
return (Convert.ToDouble(firstOperand) + Convert.ToDouble(secondOperand)).ToString();
case "-":
return (Convert.ToDouble(firstOperand) - Convert.ToDouble(secondOperand)).ToString();
case "X":
return (Convert.ToDouble(firstOperand) * Convert.ToDouble(secondOperand)).ToString();
case "÷":
// Not allow devide be zero
if (secondOperand != "0")
{
double result;
string[] parts;
int remainLength;

result = (Convert.ToDouble(firstOperand) / Convert.ToDouble(secondOperand));
// split between integer part and fractional part
parts = result.ToString().Split('.');
// if integer part length is already break max output, return error
if (parts[0].Length > maxOutputSize)
{
return "E";
}
// calculate remaining space for fractional part.
remainLength = maxOutputSize - parts[0].Length - 1;
// trim the fractional part gracefully. =
return result.ToString("N" + remainLength);
}
break;
case "%":
//your code here
return (Convert.ToDouble(firstOperand) * Convert.ToDouble(secondOperand) / 100).ToString();
}
return "E";
}

public void resetAll()
{
display = "0";
isAllowBack = true;
hasDot = false;
isAfterOperater = false;
isAfterEqual = false;
}

public void numberclick(string digit)
{
if (display is "Error")
{
return;
}
if (display.Length is 8)
{
return;
}
if (isAfterEqual)
{
resetAll();
}
if (isAfterOperater)
{
display = "0";
}
isAllowBack = true;
if (display is "0")
{
display = "";
}
display += digit;
isAfterOperater = false;
}

public void get_operate(string operate, string number)
{
if (display is "Error")
{
return;
}
if (isAfterOperater)
{
return;
}
this.operate = operate;
switch (this.operate)
{
case "+":
case "-":
case "X":
case "÷":
firstOperand = number;
isAfterOperater = true;
hasDot = false;
break;
case "%":
// your code here
firstOperand = number;
isAfterOperater = true;
hasDot = false;
break;
}
isAllowBack = false;
}

public void Equalclick()
{
if (display is "Error")
{
return;
}
string secondOperand = display;
string result = calculate(operate, firstOperand, secondOperand);
if (result is "E" || result.Length > 8)
{
display = "Error";
}
else
{
display = result;
}
isAfterEqual = true;
}

public void dotclick()
{
if (display is "Error")
{
return;
}
if (isAfterEqual)
{
resetAll();
}
if (display.Length is 8)
{
return;
}
if (!hasDot)
{
display += ".";
hasDot = true;
}
}

public void signclick()
{
if (display is "Error")
{
return;
}
if (isAfterEqual)
{
resetAll();
}
// already contain negative sign
if (display.Length is 8)
{
return;
}
if (display[0] is '-')
{
display = display.Substring(1, display.Length - 1);
}
else
{
display = "-" + display;
}
}

public void backclick()
{
if (display is "Error")
{
return;
}
if (isAfterEqual)
{
return;
}
if (!isAllowBack)
{
return;
}
if (display != "0")
{
string current = display;
char rightMost = current[current.Length - 1];
if (rightMost is '.')
{
hasDot = false;
}
display = current.Substring(0, current.Length - 1);
if (display is "" || display is "-")
{
display = "0";
}
}
}
}
}
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