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POPlus or minus minor glitch in my android calculator
 

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    <p>I have made an android calculator, and I have added the +/- button to it recently. The problems I am facing is, firstly when I use it, and press the equal button, the app crashes. Moreover as soon as I click +/- button, the digits turn into a float value, and when I type any number the number value continues after the decimal. Example: I have 200 and I press +/- the number becomes 200.0 and when I type any number it becomes 200.01. How do I overcome this problem? Can someone please let me know what are the changes required in my code? Here it is. Thank you. :)</p> <pre><code> public class MainActivity extends Activity { Typeface font1, font2; TextView tv1; private EditText Scr; //textbox screen private float NumberBf; //Save screen before pressing button operation; private String Operation; private ButtonClickListener btnClick; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); font1=Typeface.createFromAsset(getAssets(), "digits.ttf"); Scr=(EditText)findViewById(R.id.editText); Scr.setTypeface(font1); font2=Typeface.createFromAsset(getAssets(), "alexbrush.TTF"); tv1=(TextView)findViewById(R.id.textView1); tv1.setTypeface(font2); Scr = (EditText) findViewById(R.id.editText); Scr.setEnabled(false); btnClick = new ButtonClickListener(); int idList[] = {R.id.button0,R.id.button7, R.id.button1, R.id.button8,R.id.button9,R.id.button4, R.id.button5,R.id.button6,R.id.button,R.id.button2,R.id.button3,R.id.buttonDot, R.id.buttonMul,R.id.buttonDiv,R.id.buttonAdd,R.id.buttonSub,R.id.buttonC, R.id.buttonEq, R.id.buttonSqrt, R.id.buttonsquare, R.id.buttonNp }; for(int id:idList){ View v = (View) findViewById(id); v.setOnClickListener(btnClick); } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); return true; } public void mMath(String str){ NumberBf = Float.parseFloat(Scr.getText().toString()); //save the screen Operation = str; //save operation Scr.setText("0"); //Clear screen } public void getKeyboard(String str){ String ScrCurrent = Scr.getText().toString(); if(ScrCurrent.equals("0")) ScrCurrent = ""; ScrCurrent += str; Scr.setText(ScrCurrent); } public void mResult(){ float NumAf = Float.parseFloat(Scr.getText().toString()); float result = 0; if(Operation.equals("+")){ result = NumAf + NumberBf; } if(Operation.equals("-")){ result = NumberBf - NumAf; } if(Operation.equals("*")){ result = NumAf * NumberBf; } if(Operation.equals("/")){ result = NumberBf / NumAf; } Scr.setText(String.format("%10d", result)); } public void fnSqrt(){ double Number = Double.parseDouble(Scr.getText().toString()); Number = Math.sqrt(Number); Scr.setText(String.valueOf(Number)); } public void fnSquare(){ float Number1 = Float.parseFloat(Scr.getText().toString()); Number1 = pow(Number1, 2); Scr.setText(String.valueOf(Number1)); } public void fnNp(){ float Number = Float.parseFloat(Scr.getText().toString()); Number = Number*(-1); Scr.setText(String.valueOf(Number)); } private float pow(float number1, int i) { return number1*number1; } private class ButtonClickListener implements OnClickListener{ public void onClick(View v){ switch (v.getId()){ case R.id.buttonC: //Clear screen Scr.setText("0"); NumberBf = 0; Operation = ""; break; case R.id.buttonAdd: //function Add mMath("+"); break; case R.id.buttonSub: mMath("-"); break; case R.id.buttonMul: mMath("*"); break; case R.id.buttonDiv: mMath("/"); break; case R.id.buttonEq: mResult(); break; case R.id.buttonSqrt: fnSqrt(); break; case R.id.buttonNp: fnNp(); break; case R.id.buttonsquare: fnSquare(); break; default: String numb = ((Button) v).getText().toString(); getKeyboard(numb); break; } } } } </code></pre>
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    1. COSide note: variables in Java should be `camelCase`. It's very confusing for experienced Java programmers to see variables that are `TitleCase` - we assume these are classes.
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      1. USDuncan Jones
    2. COIt is unclear what you are trying to do. Since you mention the "+/-" button as being a single button I would think you are trying to use this button to change the sign of whatever your input is, but I don't see that case being handled anywhere in this code. Is this what you are trying to do?
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    3. COpublic void fnNp This is the function that is used for it.
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