If the user enters the memory key (“m”), your calculator should display the last value or operator stored in memory.

[freshg300]

private: System::Void One_Click(System::Object^ sender, System::EventArgs^ e) {

if(endProcess)
Display->Text = "0";

if(Display->Text=="0")
{
Display->Text = "1";
}
else
{
Display->Text = Convert::ToString(Display->Text) + "1";
}

endProcess = false;
}

private: System::Void Two_Click(System::Object^ sender, System::EventArgs^ e) {

if(endProcess)
Display->Text = "0";

if(Display->Text=="0")
{
Display->Text = "2";

}
else
{
Display->Text = Convert::ToString(Display->Text) + "2";

}

endProcess = false;
}

private: System::Void Three_Click(System::Object^ sender, System::EventArgs^ e) {

if(endProcess)
Display->Text = "0";

if(Display->Text=="0")
{
Display->Text = "3";
}
else
{
Display->Text = Convert::ToString(Display->Text) + "3";
}

endProcess = false;
}

private: System::Void Four_Click(System::Object^ sender, System::EventArgs^ e) {

if(endProcess)
Display->Text = "0";

if(Display->Text=="0")
{
Display->Text = "4";
}
else
{
Display->Text = Convert::ToString(Display->Text) + "4";
}

endProcess = false;
}

private: System::Void Five_Click(System::Object^ sender, System::EventArgs^ e) {

if(endProcess)
Display->Text = "0";

if(Display->Text=="0")
{
Display->Text = "5";

}
else
{
Display->Text = Convert::ToString(Display->Text) + "5";
}

endProcess = false;
}

private: System::Void Six_Click(System::Object^ sender, System::EventArgs^ e) {

if(endProcess)
Display->Text = "0";

if(Display->Text=="0")
{
Display->Text = "6";
}
else
{
Display->Text = Convert::ToString(Display->Text) + "6";
}

endProcess = false;
}

private: System::Void Seven_Click(System::Object^ sender, System::EventArgs^ e) {

if(endProcess)
Display->Text = "0";

if(Display->Text=="0")
{
Display->Text = "7";
}
else
{
Display->Text = Convert::ToString(Display->Text) + "7";

}

endProcess = false;
}

private: System::Void Eight_Click(System::Object^ sender, System::EventArgs^ e) {

if(endProcess)
Display->Text = "0";

if(Display->Text=="0")
{
Display->Text = "8";
}
else
{
Display->Text = Convert::ToString(Display->Text) + "8";
}

endProcess = false;
}

private: System::Void Nine_Click(System::Object^ sender, System::EventArgs^ e) {

if(endProcess)
Display->Text = "0";

if(Display->Text=="0")
{
Display->Text = "9";
}
else
{
Display->Text = Convert::ToString(Display->Text) + "9";
}

endProcess = false;
}

private: System::Void Zero_Click(System::Object^ sender, System::EventArgs^ e) {

if(endProcess)
Display->Text = "0";

if(Display->Text=="0")
{
Display->Text = "0";
}
else
{
Display->Text = Convert::ToString(Display->Text) + "0";
}

endProcess = false;
}

private: System::Void Subtraction_Click(System::Object^ sender, System::EventArgs^ e) {

if(Display->Text=="0")
{
Display->Text = "-";
}
else
{
Display->Text = Convert::ToString(Display->Text) + " - ";
}

endProcess = false;
}

private: System::Void Addition_Click(System::Object^ sender, System::EventArgs^ e) {

if(Display->Text=="0")
{
//Display->Text = " + ";
}
else
{
Display->Text = Convert::ToString(Display->Text) + " + ";
}

endProcess = false;
}

private: System::Void Division_Click(System::Object^ sender, System::EventArgs^ e) {

if(Display->Text == "0")
{
//Display->Text = " / ";
}
else
{
Display->Text = Convert::ToString(Display->Text) + " / ";
}

endProcess = false;

}

private: System::Void Multiplication_Click(System::Object^ sender, System::EventArgs^ e) {

if(Display->Text=="0")
{
//Display->Text = "*";
}
else
{
Display->Text = Convert::ToString(Display->Text) + " * ";
}

endProcess = false;
}

private: System::Void Backspace_Click(System::Object^ sender, System::EventArgs^ e) {

if(Display->Text->Length >0)
{
//deletes the last character displayed on screen
Display->Text = Display->Text->Substring(0,Display->Text->Length - 1);
}

endProcess = false;
}

private: System::Void Decimal_Click(System::Object^ sender, System::EventArgs^ e) {

if(endProcess)
Display->Text = "0";

if(Display->Text=="0")
{
Display->Text = "0.";
}
else
{
Display->Text = Convert::ToString(Display->Text) + ".";
}

endProcess = false;

}//end of decimal point function

private: System::Void Space_Click(System::Object^ sender, System::EventArgs^ e) {

if(Display->Text=="0")
{
Display->Text = " ";
}
else
{
Display->Text = Convert::ToString(Display->Text) + " ";
}

//allows new number to be appended to end of display text
endProcess = false;
}

private: System::Void Clear_Click(System::Object^ sender, System::EventArgs^ e) {

//clears the calculator screen
Display->Text = "0";

}

private: System::Void Power_Click(System::Object^ sender, System::EventArgs^ e) {

if(Display->Text=="0"){

// Display->Text = "^";
}
else{
Display->Text = Convert::ToString(Display->Text) + " ^ ";
}

endProcess = false;
}

private: System::Void Exit_Click(System::Object^ sender, System::EventArgs^ e) {

//assigns error message to system string variable 'message'
String^ message = "Are you sure?";

//display dialog box with error message
MessageBox::Show(message);

//exit system
exit(1);

}//end exit button

private: System::Void ClearFile_Click(System::Object^ sender, System::EventArgs^ e) {

//declaration of file pointer
ofstream expression;

//create a new file in text mode
expression.open("expression.txt", ios::out );

//check if file is open
if(expression.is_open())
{
// expression << input << endl;
expression.close();
}
else {

//assigns error message to system string variable 'message'
String^ message = "Unable to open file";

//display dialog box with error message
MessageBox::Show(message);

}//end if
}

private: System::Void FileButton_Click(System::Object^ sender, System::EventArgs^ e) {//File button function

//declaration of file pointer
ofstream expression;

//open file to appened display text to end of file
expression.open("expression.txt", ios::app);

//converts display text from system string to standard string
std::string input = msclr::interop::marshal_as< std::string >(Display->Text);

//check if file is open
if(expression.is_open())
{
//Write to file
expression << input << endl;

//close file
expression.close();
}
else
{
//assigns error message to system string variable 'message'
String^ message = "Unable to open file";

//display dialog box with error message
MessageBox::Show(message);

} // end if
}

private: System::Void MemoryRecall_Click(System::Object^ sender, System::EventArgs^ e) {


}

private: System::Void Equal_Click(System::Object^ sender, System::EventArgs^ e) {

endProcess = false;

if (Display->Text == "0"){
//empty function
}
else{
std::string infixExpression = msclr::interop::marshal_as< std::string >(Display->Text);

//invoke the method convertedinfix to convert from infix to postfix
string postfixExpression = ConvertInfix(infixExpression);

//manipulatea the expression for calculation
manipulatePostfix( postfixExpression );

//prevents numbers from being appended to end of display text
endProcess = true;
}

}//end equal button
//Class within a class to handle convertion and calculations

[TarikNeaj]

yeh. Im not gonna read through this program. So be more specific. Whats wrong here? What line of code?

Also please edit your post and put the code between code tags - http://www.cplusplus.com/articles/jEywvCM9/

[freshg300]

i'm creating a calculator using visual studios, the language being used is C++
one of the requirement is to have a button that when pressed it returns the last key or operator that the user entered.

how can i implement that key within the code?

private: System::Void MemoryRecall_Click(System::Object^ sender, System::EventArgs^ e) {


}

i've used stacks through out the program

[MiiNiPaa]

language being used is C++

It is not C++.

It is C++/CLI: another language created by Microsoft.

[freshg300]

thanks for the correction MiiNiPaa, anything to comment about the code itself?

[TarikNeaj]

You can start by doing what I told you to do.