IT 401: Basic Computer Programming Assignment 1 Deadline: 9/3/2015 Question1: (2 pt) 1.1 Explain the difference between using a computer program and programming a computer. 1.2 How do you discover syntax errors? How do you discover logic errors? 1.3 What is the difference between object and object reference? 1.4 Explain the difference between an object and a class. 1.5 What is the difference between equality and assignment? 1.6 What is the difference between a reserved word and an identifier? 1.7 What is the implicit parameter? Explain with example. 1.8 Write a java statement to convert a string str to a double. Question 2 (2 pt) 2.1 Which of the following are legal identifiers? why? Greeting1 g void 104IT IT104 Hello, World Hello3World 2.2 Construct a logical expression to represent each of the following conditions: a. x is between 3 and 15 but not equal to 10. b. x is between 10 and 20 but not odd. c. y is divisible by 5 but not by 40. d. str is a lowercase or uppercase letter. 2.3 What is the difference between the following two statements? a. if (n > 2) { if (n < 6) System.out.println("Done!"); } else System.out.println("Error"); b. if (n > 2) { if (n < 6) System.out.println("Done!"); else System.out.println("Error"); } 2.4 What is the difference between the result of the following two statements? a. int cents = (int)(100 * price + 0.5); b. int cents = (100 * price + 0.5); Question 3 (2 pt) 3.1 Write an Algorithm to decide which is cheaper car or bus for a travel: You want to decide whether you should drive your car to work or take the bus. You know the one-way distance from your home to your place of work, and the fuel efficiency of your car (in miles per g
allon). You also know the one-way price of a train ticket. You assume the cost of gas at $4 per gallon, and car maintenance at 5 cents per mile. Write an algorithm to decide which commute is cheaper. omplete the following program so that it to c only Use string concatenation3.2 prints the message “the quick white tiger jumps over the small dog”. public class ConcatDemo { public static void main(String[] args) { String animal1 = “quick white tiger”; String animal2 = “small dog”; String article = “the”; String action = “jumps over”; /* Your work goes here */ System.out.println(message); } } 3.3 Find the output of the following code when the user enters 100 and when the user enters AQ: public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.print(“Enter somthing: “); String str = in.next(); int count = Integer.parseInt(str); System.out.println(“Input is ” + count); } Question 4 (3 pt) 4.1 Write a program that simulates a simple calculator. It reads two integers and a character. If the character is a +, the sum is printed; if it is a -, the difference is printed; if it is a *, the product is printed; if it is a /, the quotient is printed; and if it is a %, the remainder is printed. 4.2 In the 2- dimensional plane, a point is described by its two coordinates x and y. It supports these operations : ? A constructor allowing initialization of both coordinates ? Accessors and mutators to its coordinates ? Translation of a point a. Write a java class, called MyPoint, that corresponds to such an abstraction of points in the dimensional plane. b. Provide a tester class that creates one point, then translates and displays its new coordinates.