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import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; public class MainActivity extends AppCompatActivity { // Declare the views that we will be using in our layout EditText etNum1; EditText etNum2; Button btnAdd; Button btnSubtract; Button btnMultiply; Button btnDivide; Button btnClear; EditText etResult; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Initialize the views etNum1 = (EditText) findViewById(R.id.etNum1); etNum2 = (EditText) findViewById(R.id.etNum2); btnAdd = (Button) findViewById(R.id.btnAdd); btnSubtract = (Button) findViewById(R.id.btnSubtract); btnMultiply = (Button) findViewById(R.id.btnMultiply); btnDivide = (Button) findViewById(R.id.btnDivide); btnClear = (Button) findViewById(R.id.btnClear); etResult = (EditText) findViewById(R.id.etResult); // Set the click listeners for the buttons btnAdd.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // Perform the addition and display the result double num1 = Double.parseDouble(etNum1.getText().toString()); double num2 = Double.parseDouble(etNum2.getText().toString()); double result = num1 + num2; etResult.setText(Double.toString(result)); } }); btnSubtract.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // Perform the subtraction and display the result double num1 = Double.parseDouble(etNum1.getText().toString()); double num2 = Double.parseDouble(etNum2.getText().toString()); double result = num1 - num2; etResult.setText(Double.toString(result)); } }); btnMultiply.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // Perform the multiplication and display the result double num1 = Double.parseDouble(etNum1.getText().toString()); double num2 = Double.parseDouble(etNum2.getText().toString()); double result = num1 * num2; etResult.setText(Double.toString(result)); } }); btnDivide.setOnClickListener(
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