public class Expressions {
    // You can ignore the next few lines
    public static void main(String[] args) {
        double a = Double.parseDouble(args[0]);
        double b = Double.parseDouble(args[1]);
        double c = Double.parseDouble(args[2]);
        double d = Double.parseDouble(args[3]);
        System.out.println("a = " + a + ", b = " + b
                        + ", c = " + c + ", d = " + d);

        // Make changes after this line
        double expr1 = 0; // change this line for expression 1
        System.out.println("Expression 1: " + expr1); // do not change line

        double expr2 = 0; // change this line for expression 2
        System.out.println("Expression 2: " + expr2); // do not change line

        double expr3 = 0; // change this line for expression 3
        System.out.println("Expression 3: " + expr3); // do not change line

        double expr4 = 0; // change this line for expression 4
        System.out.println("Expression 4: " + expr4); // do not change line

        double expr5 = 0; // change this line for expression 5
        System.out.println("Expression 5: " + expr5); // do not change line
    }

    // Add extra credit after this line
}