Thread: Windows Calculator.

Im trying to create a calculator similar to the windows standard calculator where in when you click "5" and then clicked "+" by mistake you just have to click "-" for the output to be "5 -" not "5 +". Problem is i don't know howto do that with my current code.

try
				{	
					if(inpuDisplay.contains("."))
					{
						doubleResult = new Double(Double.parseDouble(inpuDisplay)).toString();
 
						inpuDisplay = doubleResult;
					}
 
					else
					{
						doubleResult = new Integer(Integer.parseInt(inpuDisplay)).toString();
 
						inpuDisplay = doubleResult;
					}
 
					resDisplay = inpuDisplay + " + ";
 
					res2Display = res2Display + resDisplay;
 
					inpu2Display = display.getText().toString();
 
					input.setText(res2Display);
 
 
					display.setText("");
 
					if(add == true)
					{
						result = result + Double.parseDouble(inpu2Display);
 
						minus = false;
						mul = false;
						div = false;
					}
 
					if(minus == true)
					{			
						if(result == 0)
						{
							result = Double.parseDouble(inpu2Display);
						}
 
						else if(result < 0)
						{
							result = result - Double.parseDouble(inpu2Display);
						}
 
						else if(result > 0)
						{
							result = result - Double.parseDouble(inpu2Display);
						}
 
						minus = false;
						add = true;
					}
 
					if(mul == true)
					{
						if(result == 0)
						{
							result = Double.parseDouble(inpu2Display);
						}
 
						else
						{
							result = result * Double.parseDouble(inpu2Display);
						}
 
						mul = false;
						add = true;
					}
 
					if(div == true)
					{
						if(result == 0)
						{
							result = Double.parseDouble(inpu2Display);
						}
 
						else
						{
							result = result / Double.parseDouble(inpu2Display);
						}					
 
						div = false;
						add = true;
					}
 
					if(result % 1 == 0)
					{
						display.setText(Integer.toString((int)result));
					}
 
					else
					{
						display.setText(Double.toString(result));
					}
 
					inpuDisplay = "";
					inpu2Display = "";
				}
 
				catch(Exception e)
				{
 
				}

NOTE: The above code is executed when yhe "+" button is clicked. And is working i just have to add the replace sign function. Could someone please help?

I agree with all KW said, but I'm also confused why this is a problem. The action listeners for the arithmetic operation keys should be programmed to do what you've described.

Im trying to create a calculator similar to the windows standard calculator where in when you click "5" and then clicked "+" by mistake you just have to click "-" for the output to be "5 -" not "5 +". Problem is i don't know howto do that with my current code.

try
				{	
					if(inpuDisplay.contains("."))
					{
						doubleResult = new Double(Double.parseDouble(inpuDisplay)).toString();
 
						inpuDisplay = doubleResult;
					}
 
					else
					{
						doubleResult = new Integer(Integer.parseInt(inpuDisplay)).toString();
 
						inpuDisplay = doubleResult;
					}
 
					resDisplay = inpuDisplay + " + ";
 
					res2Display = res2Display + resDisplay;
 
					inpu2Display = display.getText().toString();
 
					input.setText(res2Display);
 
 
					display.setText("");
 
					if(add == true)
					{
						result = result + Double.parseDouble(inpu2Display);
 
						minus = false;
						mul = false;
						div = false;
					}
 
					if(minus == true)
					{			
						if(result == 0)
						{
							result = Double.parseDouble(inpu2Display);
						}
 
						else if(result < 0)
						{
							result = result - Double.parseDouble(inpu2Display);
						}
 
						else if(result > 0)
						{
							result = result - Double.parseDouble(inpu2Display);
						}
 
						minus = false;
						add = true;
					}
 
					if(mul == true)
					{
						if(result == 0)
						{
							result = Double.parseDouble(inpu2Display);
						}
 
						else
						{
							result = result * Double.parseDouble(inpu2Display);
						}
 
						mul = false;
						add = true;
					}
 
					if(div == true)
					{
						if(result == 0)
						{
							result = Double.parseDouble(inpu2Display);
						}
 
						else
						{
							result = result / Double.parseDouble(inpu2Display);
						}					
 
						div = false;
						add = true;
					}
 
					if(result % 1 == 0)
					{
						display.setText(Integer.toString((int)result));
					}
 
					else
					{
						display.setText(Double.toString(result));
					}
 
					inpuDisplay = "";
					inpu2Display = "";
				}
 
				catch(Exception e)
				{
 
				}

NOTE: The above code is executed when yhe "+" button is clicked. And is working i just have to add the replace sign function. Could someone please help?

Please don't start duplicate topics.

Continue working this problem in the original post, adding any clarifications and changes in direction there as needed. If that original topic needs to be moved to another subforum, please ask a mod to do that for you.

Threads merged

opss sorry. just found out that there is an android section here. coz my im doing this in Eclipse for my android project.