Q1.What do you understand by complier error and run time error? Explain by example.

Q2. What is wrong with the following variable declarations?

int Km/h = 120;

String Newcar = GMC;

int Adouble = "50";

String newCar = "GMC"

int x = 5, y = "x";

String new Car = "GMC";

Q3. What does this sequence of statements print?

String msg = "The number of characters in newCar is";

String newCar = "GMC";

int numberOfCharacters = newCar.length();

String carUpperCase = newCar.toUpperCase();

System.out.print(newCar);

System.out.println(carUpperCase);

System.out.print(msg);

System.out.println(newCar.length());

newCar.replace("C","U");

newCar.replace("M","E");

newCar.replace("G","S");

System.out.print("Welcome to : ");

System.out.println(newCar);

/*System.out.println("Good luck");

System.out.println("to all students");*/

Q4. Consider the following class:

public class IdentifyMyParts
{
private int x = 7;
private int y = 3;
}

a. What are the instance variables?

b. What is the output from the following code:

IdentifyMyParts a = new IdentifyMyParts();
IdentifyMyParts b = new IdentifyMyParts();
a.y = 5;
b.y = 6;
a.x = 1;
b.x = 2;
System.out.println("a.y = " + a.y);
System.out.println("b.y = " + b.y);
System.out.println("a.x = " + a.x);
System.out.println("b.x = " + b.x);

Q5. What is the output of the following code:

a.
int num1 = 6;
int num2 = 10;
num1 = num1 + num2;
num2 = num1 + num2;
System.out.println(num1 + ", " + num2);

b.

int a = 10;
int b = 20;
int c = 2;
int x = b / a /*c*/;

Q6. Write a Java program that performs the following:

1. Identify the radius of the circle. (radius = 3)

2. Calculate circumference and area of the circle.

3. Print the results.