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1 change: 1 addition & 0 deletions 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>
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236 changes: 236 additions & 0 deletions CPE200Lab1/CPE200Lab1/CalculatorEngine.cs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,236 @@
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 Display()
{
return display;
}
private void resetAll()
{
lblDisplay.Text = "0";
isAllowBack = true;
hasDot = false;
isAfterOperater = false;
isAfterEqual = false;
}

private 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
break;
}
return "E";
}

public MainForm()
{
InitializeComponent();

resetAll();
}

private void btnNumber_Click(object sender, EventArgs e)
{
if (lblDisplay.Text is "Error")
{
return;
}
if (isAfterEqual)
{
resetAll();
}
if (isAfterOperater)
{
lblDisplay.Text = "0";
}
if (lblDisplay.Text.Length is 8)
{
return;
}
isAllowBack = true;
string digit = ((Button)sender).Text;
if (lblDisplay.Text is "0")
{
lblDisplay.Text = "";
}
lblDisplay.Text += digit;
isAfterOperater = false;
}

private void btnOperator_Click(object sender, EventArgs e)
{
if (lblDisplay.Text is "Error")
{
return;
}
if (isAfterOperater)
{
return;
}
operate = ((Button)sender).Text;
switch (operate)
{
case "+":
case "-":
case "X":
case "÷":
firstOperand = lblDisplay.Text;
isAfterOperater = true;
break;
case "%":
// your code here
break;
}
isAllowBack = false;
}

private void btnEqual_Click(object sender, EventArgs e)
{
if (lblDisplay.Text is "Error")
{
return;
}
string secondOperand = lblDisplay.Text;
string result = calculate(operate, firstOperand, secondOperand);
if (result is "E" || result.Length > 8)
{
lblDisplay.Text = "Error";
}
else
{
lblDisplay.Text = result;
}
isAfterEqual = true;
}

private void btnDot_Click(object sender, EventArgs e)
{
if (lblDisplay.Text is "Error")
{
return;
}
if (isAfterEqual)
{
resetAll();
}
if (lblDisplay.Text.Length is 8)
{
return;
}
if (!hasDot)
{
lblDisplay.Text += ".";
hasDot = true;
}
}

private void btnSign_Click(object sender, EventArgs e)
{
if (lblDisplay.Text is "Error")
{
return;
}
if (isAfterEqual)
{
resetAll();
}
// already contain negative sign
if (lblDisplay.Text.Length is 8)
{
return;
}
if (lblDisplay.Text[0] is '-')
{
lblDisplay.Text = lblDisplay.Text.Substring(1, lblDisplay.Text.Length - 1);
}
else
{
lblDisplay.Text = "-" + lblDisplay.Text;
}
}

private void btnClear_Click(object sender, EventArgs e)
{
resetAll();
}

private void btnBack_Click(object sender, EventArgs e)
{
if (lblDisplay.Text is "Error")
{
return;
}
if (isAfterEqual)
{
return;
}
if (!isAllowBack)
{
return;
}
if (lblDisplay.Text != "0")
{
string current = lblDisplay.Text;
char rightMost = current[current.Length - 1];
if (rightMost is '.')
{
hasDot = false;
}
lblDisplay.Text = current.Substring(0, current.Length - 1);
if (lblDisplay.Text is "" || lblDisplay.Text is "-")
{
lblDisplay.Text = "0";
}
}
}
}
}

}
}
8 changes: 3 additions & 5 deletions CPE200Lab1/CPE200Lab1/MainForm.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,14 +18,12 @@ public partial class MainForm : Form
private bool isAfterEqual;
private string firstOperand;
private string operate;
private CalculatorEngine engine = new CalculatorEngine();

private void resetAll()
{
lblDisplay.Text = "0";
isAllowBack = true;
hasDot = false;
isAfterOperater = false;
isAfterEqual = false;
lblDisplay.Text = engine.Display();
engine.resetAll();
}

private string calculate(string operate, string firstOperand, string secondOperand, int maxOutputSize = 8)
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