CMPS 200 Homework Assignment 3, Fall 2012

Faculty of Arts & Sciences Department of Computer Science CMPS 200—Introduction to Programming Assignment 3 – Due Monday Oct 15, 2012 Reading Material  The String data type. pp 179-183 in section 3.3 of the text.  Command line arguments. Class notes.  Conditionals. Chapter 4 of textbook. Exercises 1. Reverse. Write a method printReverse that accepts a string as argument and prints the characters in opposite order. The signature of the method should be: public static void printReverse(String str) Use the method to write a program that takes an integer command line argument N followed by N strings and prints each of the strings in its reverse order. 2. Reverse2. Write a method stringReverse that accepts a string as argument and returns a string with the characters in opposite order (the method should not print anything to the console). The signature of the method should be: public static String stringReverse(String str) Hint: The method should build a string one character at a time using the + operator, starting with the empty string ””. Use this method to rewrite the program above that takes an integer command line argument N followed by N strings and prints each of the string in its reverse order. 3. Vowels. Write a static method isVowel that returns true or false depending on whether its argument is a vowel or a consonant: public static boolean isVowel(char c) Use the method above to write a program Vowels.java that takes a string argument on the command line and prints the number of vowels in the string. 4. Quadrant. Write a program Quadrant that takes the x-y coordinates of a point in a Cartesian plane (assumed to be integers). The program should output a message indicating whether the point is the origin, is located on the x axis, is located on the y axis, or appears in a particular quadrant. Examples: (0,0) is the origin (4,0) is on the x-axis (0,-3) is on the y-axis (-2,3) is in the second quadrant 5. LeapYear. Write a program LeapYear that takes a positive integer command line argument representing a year number and prints true if the year is leap and false otherwise. A leap year is a year divisible by 4 but not by 100, or is divisible by 400. You may not use a conditional statement in your program. You will need to write an appropriate Boolean expression that evaluates to the correct true/false answer. 6. Leap5. Write a method that returns a boolean value if its argument is a leap year: public static boolean isLeap(int year) and use it to write a program Leap5 that takes 5 positive integers as command line arguments and prints only the years that are not leap. 7. BMI. The body mass index (BMI) is the ratio of the weight of a person (in kilograms) to the square of the height (in meters). Write a program BMI.java that takes two command-line arguments, weight and height, computes the BMI, and prints out the corresponding BMI category:  Starvation: less than 15  Anorexic: less than 17.5  Underweight: less than 18.5 Introduction to Computer Programming (CMPS 200) Fall 2012 2 of 2  Ideal: greater than or equal to 18.5 but less than 25  Overweight: greater than or equal to 25 but less than 30  Obese: greater than or equal to 30 but less than 40  Morbidly Obese: greater than or equal to 40 8. SumPrimes. Write a program that takes a command line argument N and a sequence of N positive integers and prints the numbers that are prime only, followed by their sum. Hint: Write a method with the following signature, that returns a boolean value indicating whether an integer is prime or not. public static boolean isPrime(int n) Submission Instructions and Notes  As usual, submit your commented source code and sample runs in a zip file named s#_asst3_netid, where # is your section number (between 1 and 9) and netid stands for your AUBnet user name.