Calculator and Currency converter

Calc.java

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+// Java program for simple calculator 
+
+import java.io.*; 
+import java.lang.*; 
+import java.lang.Math; 
+import java.util.Scanner; 
+public class BasicCalculator { 
+
+	public static void main(String[] args) 
+	{ 
+		// stores two numbers 
+		double num1, num2; 
+
+		// Take input from the user 
+		Scanner sc = new Scanner(System.in); 
+
+		System.out.println("Enter the numbers"); 
+
+		// take the inputs 
+		num1 = sc.nextDouble(); 
+
+		num2 = sc.nextDouble(); 
+
+		System.out.println("Enter the operator (+,-,*,/)"); 
+
+		char op = sc.next().charAt(0); 
+
+		double o = 0; 
+
+		switch (op) { 
+
+		// case to add two numbers 
+		case '+': 
+
+			o = num1 + num2; 
+
+			break; 
+
+		// case to subtract two numbers 
+		case '-': 
+
+			o = num1 - num2; 
+
+			break; 
+
+		// case to multiply two numbers 
+		case '*': 
+
+			o = num1 * num2; 
+
+			break; 
+
+		// case to divide two numbers 
+		case '/': 
+
+			o = num1 / num2; 
+
+			break; 
+
+		default: 
+
+			System.out.println("You enter wrong input"); 
+
+			break; 
+		} 
+
+		System.out.println("The final result:"); 
+
+		System.out.println(); 
+
+		// print the final result 
+		System.out.println(num1 + " " + op + " " + num2 
+						+ " = " + o); 
+	} 
+}

Currency Converter.java

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+// Java program to convert from 
+// rupee to the dollar and vice-versa 
+// using Java Swing 
+
+import javax.swing.*; 
+import java.awt.*; 
+import java.awt.event.*; 
+public class GFG { 
+
+	// Function to convert from rupee 
+	// to the dollar and vice-versa 
+	// using Java Swing 
+	public static void converter() 
+	{ 
+
+		// Creating a new frame using JFrame 
+		JFrame f = new JFrame("CONVERTER"); 
+
+		// Creating two labels 
+		JLabel l1, l2; 
+
+		// Creating two text fields. 
+		// One for rupee and one for 
+		// the dollar 
+		JTextField t1, t2; 
+
+		// Creating three buttons 
+		JButton b1, b2, b3; 
+
+		// Naming the labels and setting 
+		// the bounds for the labels 
+		l1 = new JLabel("Rupees:"); 
+		l1.setBounds(20, 40, 60, 30); 
+		l2 = new JLabel("Dollars:"); 
+		l2.setBounds(170, 40, 60, 30); 
+
+		// Initializing the text fields with 
+		// 0 by default and setting the 
+		// bounds for the text fields 
+		t1 = new JTextField("0"); 
+		t1.setBounds(80, 40, 50, 30); 
+		t2 = new JTextField("0"); 
+		t2.setBounds(240, 40, 50, 30); 
+
+		// Creating a button for INR, 
+		// one button for the dollar 
+		// and one button to close 
+		// and setting the bounds 
+		b1 = new JButton("INR"); 
+		b1.setBounds(50, 80, 60, 15); 
+		b2 = new JButton("Dollar"); 
+		b2.setBounds(190, 80, 60, 15); 
+		b3 = new JButton("close"); 
+		b3.setBounds(150, 150, 60, 30); 
+
+		// Adding action listener 
+		b1.addActionListener(new ActionListener() { 
+			public void actionPerformed(ActionEvent e) 
+			{ 
+				// Converting to double 
+				double d 
+					= Double.parseDouble(t1.getText()); 
+
+				// Converting rupees to dollars 
+				double d1 = (d / 65.25); 
+
+				// Getting the string value of the 
+				// calculated value 
+				String str1 = String.valueOf(d1); 
+
+				// Placing it in the text box 
+				t2.setText(str1); 
+			} 
+		}); 
+
+		// Adding action listener 
+		b2.addActionListener(new ActionListener() { 
+			public void actionPerformed(ActionEvent e) 
+			{ 
+				// Converting to double 
+				double d2 
+					= Double.parseDouble(t2.getText()); 
+
+				// converting Dollars to rupees 
+				double d3 = (d2 * 65.25); 
+
+				// Getting the string value of the 
+				// calculated value 
+				String str2 = String.valueOf(d3); 
+
+				// Placing it in the text box 
+				t1.setText(str2); 
+			} 
+		}); 
+
+		// Action listener to close the form 
+		b3.addActionListener(new ActionListener() { 
+			public void actionPerformed(ActionEvent e) 
+			{ 
+				f.dispose(); 
+			} 
+		}); 
+
+		// Default method for closing the frame 
+		f.addWindowListener(new WindowAdapter() { 
+			public void windowClosing(WindowEvent e) 
+			{ 
+				System.exit(0); 
+			} 
+		}); 
+
+		// Adding the created objects 
+		// to the form 
+		f.add(l1); 
+		f.add(t1); 
+		f.add(l2); 
+		f.add(t2); 
+		f.add(b1); 
+		f.add(b2); 
+		f.add(b3); 
+
+		f.setLayout(null); 
+		f.setSize(400, 300); 
+		f.setVisible(true); 
+	} 
+
+	// Driver code 
+	public static void main(String args[]) 
+	{ 
+		converter(); 
+	} 
+}