void className::keyPressEvent(QKeyEvent *event)
{
switch(event->key())
{

//ABC's
case Qt::Key_A:	ui->display->setText("A");
break;
case Qt::Key_B:	ui->display->setText("B");
break;
case Qt::Key_C:	ui->display->setText("C");
break;
case Qt::Key_D:	ui->display->setText("D");
break;
case Qt::Key_E:	ui->display->setText("E");
break;
case Qt::Key_F:	ui->display->setText("F");
break;
case Qt::Key_G:	ui->display->setText("G");
break;
case Qt::Key_H:	ui->display->setText("H");
break;
case Qt::Key_I:	ui->display->setText("I");
break;
case Qt::Key_J:	ui->display->setText("J");
break;
case Qt::Key_K:	ui->display->setText("K");
break;
case Qt::Key_L:	ui->display->setText("L");
break;
case Qt::Key_M:	ui->display->setText("M");
break;
case Qt::Key_N:	ui->display->setText("N");
break;
case Qt::Key_O:	ui->display->setText("O");
break;
case Qt::Key_P:	ui->display->setText("P");
break;
case Qt::Key_Q:	ui->display->setText("Q");
break;
case Qt::Key_R:	ui->display->setText("R");
break;
case Qt::Key_S:	ui->display->setText("S");
break;
case Qt::Key_T:	ui->display->setText("T");
break;
case Qt::Key_U:	ui->display->setText("U");
break;
case Qt::Key_V:	ui->display->setText("V");
break;
case Qt::Key_W:	ui->display->setText("W");
break;
case Qt::Key_X:	ui->display->setText("X");
break;
case Qt::Key_Y:	ui->display->setText("Y");
break;
case Qt::Key_Z:	ui->display->setText("Z");
break;
// Numbers - Both number line and number pad
case Qt::Key_1:	ui->display->setText("1");
break;
case Qt::Key_2:	ui->display->setText("2");
break;
case Qt::Key_3:	ui->display->setText("3");
break;
case Qt::Key_4:	ui->display->setText("4");
break;
case Qt::Key_5:	ui->display->setText("5");
break;
case Qt::Key_6:	ui->display->setText("6");
break;
case Qt::Key_7:	ui->display->setText("7");
break;
case Qt::Key_8:	ui->display->setText("8");
break;
case Qt::Key_9:	ui->display->setText("9");
break;
case Qt::Key_0:	ui->display->setText("0");
break;
// Special characters above number line.
case Qt::Key_Exclam:	ui->display->setText("!");
break;
case Qt::Key_At:	ui->display->setText("@");
break;
case Qt::Key_NumberSign:	ui->display->setText("#");
break;
case Qt::Key_Dollar:	ui->display->setText("$");
break;
case Qt::Key_Percent:	ui->display->setText("%");
break;
case Qt::Key_AsciiCircum:	ui->display->setText("^");
break;
case Qt::Key_Ampersand:	ui->display->setText("&");
break;
case Qt::Key_Asterisk:	ui->display->setText("*");
break;
case Qt::Key_ParenLeft:	ui->display->setText("(");
break;
case Qt::Key_ParenRight:	ui->display->setText(")");
break;
// Other special charachers.
// Starting at top-left corner of keyboard.
// Top of key (Shift +).
// Bottom of key.
case Qt::Key_AsciiTilde:	ui->display->setText(" ~ ");
break;
case Qt::Key_Apostrophe:	ui->display->setText(" ' ");
break;
case Qt::Key_Underscore:	ui->display->setText(" _ ");
break;
case Qt::Key_Minus:	ui->display->setText(" - ");
break;
case Qt::Key_Plus:	ui->display->setText(" + ");
break;
case Qt::Key_Equal:	ui->display->setText(" = ");
break;
case Qt::Key_BraceLeft:	ui->display->setText(" { ");
break;
case Qt::Key_BracketLeft:	ui->display->setText(" [ ");
break;
case Qt::Key_BraceRight:	ui->display->setText(" } ");
break;
case Qt::Key_BracketRight:	ui->display->setText(" ] ");
break;
case Qt::Key_Bar:	ui->display->setText(" | ");
break;
// When printing a \ place a back slash before it.
case Qt::Key_Backslash:	ui->display->setText(" \\ ");
break;
case Qt::Key_Colon:	ui->display->setText(" : ");
break;
case Qt::Key_Semicolon:	ui->display->setText(" ; ");
break;
// When printing a " place a back slash before it.
case Qt::Key_QuoteDbl:	ui->display->setText(" \" ");
break;
// When printing a ' place a back slash before it.
case Qt::Key_QuoteLeft:	ui->display->setText(" \' ");
break;
case Qt::Key_Less:	ui->display->setText(" < ");
break;
case Qt::Key_Comma:	ui->display->setText(" , ");
break;
case Qt::Key_Greater:	ui->display->setText(" > ");
break;
case Qt::Key_Period:	ui->display->setText(" . ");
break;
case Qt::Key_Question:	ui->display->setText(" ? ");
break;
case Qt::Key_Slash:	ui->display->setText(" / ");
break;
//Command Keys
//Key next to right pinky.
case Qt::Key_Return:	ui->display->setText("Return Key Entered");
break;
//Key next to number pad.
case Qt::Key_Enter:	ui->display->setText("Enter Key Entered");
break;
case Qt::Key_Space:	ui->display->setText("Space Bar");
break;
case Qt::Key_Escape:	ui ->display->setText("Escape");
break;
case Qt::Key_Tab:	ui ->display->setText("Tab");
break;
case Qt::Key_Backtab:	ui ->display->setText("Backtab");
break;
case Qt::Key_Backspace:	ui ->display->setText("Backspace");
break;
case Qt::Key_Insert:	ui ->display->setText("Insert");
break;
case Qt::Key_Delete:	ui ->display->setText("Delete");
break;
// The Pause/Break key (Note: Not anything to do with pausing media)
case Qt::Key_Pause:	ui ->display->setText("Pause");
break;
case Qt::Key_Print:	ui ->display->setText("Print");
break;
case Qt::Key_SysReq:	ui ->display->setText("SysReq");
break;
case Qt::Key_Clear:	ui ->display->setText("Clear");
break;
case Qt::Key_Home:	ui ->display->setText("Home");
break;
case Qt::Key_End:	ui ->display->setText("End");
break;
case Qt::Key_Left:	ui ->display->setText("Left Arrow");
break;
case Qt::Key_Up:	ui ->display->setText("Up Arrow");
break;
case Qt::Key_Right:	ui ->display->setText("Right Arrow");
break;
case Qt::Key_Down:	ui ->display->setText("Down Arrow");
break;
case Qt::Key_PageUp:	ui ->display->setText("Page Up");
break;
case Qt::Key_PageDown:	ui ->display->setText("Page Down");
break;
case Qt::Key_Shift:	ui ->display->setText("Shift");
break;
//On Mac OS X, this corresponds to the Command keys.
case Qt::Key_Control:	ui ->display->setText("Control");
break;
//On Mac OS X, this corresponds to the Control keys.
//On Windows keyboards, this key is mapped to the Windows key.
case Qt::Key_Meta:	ui ->display->setText("Meta");
break;
case Qt::Key_Alt:	ui ->display->setText("Alt");
break;
//On Windows, when the KeyDown event for this key is sent,
//the Ctrl+Alt modifiers are also set.
case Qt::Key_AltGr:	ui ->display->setText("AltGr");
break;
case Qt::Key_CapsLock:	ui ->display->setText("Caps Lock");
break;
//NumLock will activate or de-activate the numbers or the
//commands on the number pad.
case Qt::Key_NumLock:	ui ->display->setText("NumLock");
break;
case Qt::Key_ScrollLock:	ui ->display->setText("Scroll Lock");
break;
// F1-F12
case Qt::Key_F1:	ui ->display->setText("F1");
break;
case Qt::Key_F2:	ui ->display->setText("F2");
break;
case Qt::Key_F3:	ui ->display->setText("F3");
break;
case Qt::Key_F4:	ui ->display->setText("F4");
break;
case Qt::Key_F5:	ui ->display->setText("F5");
break;
case Qt::Key_F6:	ui ->display->setText("F6");
break;
case Qt::Key_F7:	ui ->display->setText("F7");
break;
case Qt::Key_F8:	ui ->display->setText("F8");
break;
case Qt::Key_F9:	ui ->display->setText("F9");
break;
case Qt::Key_F10:	ui ->display->setText("F10");
break;
case Qt::Key_F11:	ui ->display->setText("F11");
break;
case Qt::Key_F12:	ui ->display->setText("F12");
break;

      }
}