AkashAfraz4032
commented
3 months ago <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="16dp"> <EditText android:id="@+id/edit_text_display" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="0" android:inputType="none" android:textSize="24sp" android:padding="16dp" android:layout_marginBottom="16dp" /> <GridLayout android:id="@+id/basic_buttons" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@id/edit_text_display" android:columnCount="4" android:rowCount="5" android:layout_marginBottom="16dp">
<Button
android:id="@+id/button_0" android:text="0" android:onClick="onDigitClick" /> <Button android:id="@+id/button_1" android:text="1" android:onClick="onDigitClick" /> <Button android:id="@+id/button_2" android:text="2" android:onClick="onDigitClick" /> <Button android:id="@+id/button_3" android:text="3" android:onClick="onDigitClick" /> <Button android:id="@+id/button_4" android:text="4" android:onClick="onDigitClick" /> <Button android:id="@+id/button_5" android:text="5" android:onClick="onDigitClick" /> <Button android:id="@+id/button_6" android:text="6" android:onClick="onDigitClick" /> <Button android:id="@+id/button_7" android:text="7" android:onClick="onDigitClick" /> <Button android:id="@+id/button_8" android:text="8" android:onClick="onDigitClick" />
<Button android:id="@+id/button_9" android:text="9" android:onClick="onDigitClick" /> <Button android:id="@+id/button_dot" android:text="." android:onClick="onDecimalClick" /> <Button android:id="@+id/button_add" android:text="+" android:onClick="onOperatorClick" /> <Button android:id="@+id/button_subtract" android:text="-" android:onClick="onOperatorClick" /> <Button android:id="@+id/button_multiply" android:text="*" android:onClick="onOperatorClick" /> <Button android:id="@+id/button_divide" android:text="/" android:onClick="onOperatorClick" /> <Button android:id="@+id/button_equal" android:text="=" android:onClick="onEqualClick" /> <Button android:id="@+id/button_clear" android:text="C" android:onClick="onClearClick" /> <GridLayout
android:id="@+id/scientific_buttons" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@id/basic_buttons" android:columnCount="4" android:rowCount="2">
<Button android:id="@+id/button_sin" android:text="sin" android:onClick="onFunctionClick" /> <Button android:id="@+id/button_cos" android:text="cos" android:onClick="onFunctionClick" /> <Button android:id="@+id/button_tan" android:text="tan" android:onClick="onFunctionClick" /> <Button android:id="@+id/button_log" android:text="log" android:onClick="onFunctionClick" />
JAVA CODE: package com.example.cal; import android.annotation.SuppressLint; import android.os.Bundle; import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import java.util.Stack;
public class MainActivity extends AppCompatActivity {
private EditText display;
private final StringBuilder input = new StringBuilder();
private final Stack
findViewById(R.id.button_add).setOnClickListener(this::onOperatorClick); findViewById(R.id.button_subtract).setOnClickListener(this::onOperatorClick); findViewById(R.id.button_multiply).setOnClickListener(this::onOperatorClick); findViewById(R.id.button_divide).setOnClickListener(this::onOperatorClick); findViewById(R.id.button_sin).setOnClickListener(this::onFunctionClick); findViewById(R.id.button_cos).setOnClickListener(this::onFunctionClick); findViewById(R.id.button_tan).setOnClickListener(this::onFunctionClick); findViewById(R.id.button_log).setOnClickListener(this::onFunctionClick); findViewById(R.id.button_clear).setOnClickListener(v -> clearDisplay()); findViewById(R.id.button_equal).setOnClickListener(v -> calculateResult()); } private void onDigitClick(View view) { Button button = (Button) view; input.append(button.getText().toString()); display.setText(input.toString()); } private void onDecimalClick(View view) { if (input.length() == 0 || !input.toString().contains(".")) { input.append("."); display.setText(input.toString()); } } private void onOperatorClick(View view) { if (input.length() > 0 && Character.isDigit(input.charAt(input.length() - 1))) { Button button = (Button) view; input.append(button.getText().toString()); display.setText(input.toString()); } else { Toast.makeText(this, "Invalid input", Toast.LENGTH_SHORT).show(); } }
private void onFunctionClick(View view) { if (input.length() == 0) { Toast.makeText(this, "Enter a value first", Toast.LENGTH_SHORT).show(); return; } Button button = (Button) view; String function = button.getText().toString(); try { double value = Double.parseDouble(input.toString()); double result; switch (function) { case "sin": result = Math.sin(Math.toRadians(value)); break; case "cos": result = Math.cos(Math.toRadians(value)); break; case "tan": result = Math.tan(Math.toRadians(value)); break; case "log": if (value <= 0) {
throw new ArithmeticException("Logarithm undefined for non- positive values");
} result = Math.log10(value); break; default: throw new IllegalArgumentException("Unknown function: " + function); }
display.setText(String.valueOf(result)); input.setLength(0); } catch (NumberFormatException e) { Toast.makeText(this, "Invalid input", Toast.LENGTH_SHORT).show(); } catch (ArithmeticException e) { Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show(); } } private void calculateResult() { if (!isValidInput()) { Toast.makeText(this, "Invalid input", Toast.LENGTH_SHORT).show(); return; } try { numbers.clear(); operators.clear(); String expression = input.toString(); StringBuilder numBuffer = new StringBuilder(); for (int i = 0; i < expression.length(); i++) { char c = expression.charAt(i); if (Character.isDigit(c) || c == '.') { numBuffer.append(c); } else { if (numBuffer.length() > 0) { numbers.push(Double.parseDouble(numBuffer.toString())); numBuffer.setLength(0); } while (!operators.isEmpty() && precedence(operators.peek()) >= precedence(c)) {
evaluate(); } operators.push(c); } } if (numBuffer.length() > 0) { numbers.push(Double.parseDouble(numBuffer.toString())); } while (!operators.isEmpty()) { evaluate(); } if (!numbers.isEmpty()) { double result = numbers.pop(); display.setText(String.valueOf(result)); input.setLength(0); } } catch (Exception e) { Toast.makeText(this, "Error: " + e.getMessage(), Toast.LENGTH_SHORT).show(); } } private boolean isValidInput() { return input.length() > 0 && Character.isDigit(input.charAt(input.length() - 1)); } private void evaluate() { double b = numbers.pop(); double a = numbers.pop(); char op = operators.pop();
double result; switch (op) { case '+': result = a + b; break; case '-': result = a - b; break; case '': result = a b; break; case '/': if (b == 0) { throw new ArithmeticException("Cannot divide by zero"); } result = a / b; break; default: throw new IllegalArgumentException("Unknown operator: " + op); } numbers.push(result); } private int precedence(char op) { switch (op) { case '+': case '-': return 1; case '*': case '/': return 2; default: return -1; }
Scientific Calculator to solve Problem