CSE114: Homework 1 Spring 2022

CSE114: Introduction to Object Oriented ProgrammingSpring 2022 Homework1: Due Date: Homework1 is due by 11:59 PM on Sunday, March 7, 2022. Submit your work (the .java source code files ONLY, not the compiled .class files!) through the “Homework1” link on Blackboard. You may submit an unlimited number of times; we will only grade the last/latest submission attempt, but be sure to attach all of your files to each submission attempt. Be sure to include your name and Stony Brook ID number in a comment at the beginning of each file that you submit. Instructions: This assignment is worth 40 points (10 points per program). 1. Write a program that reads three edges (sides) for a triangle and classify it as Equilateral, Scalene, Isosceles if the input is valid. The input is valid if the sum of every pair of two edges is greater than the remaining edge. You may assume that the user inputs a positivevalue for the edges. Here is a sample run. Side1:3 Side2:3 Side3:9 Output: Invalid input! Side1:3 Side2:3 Side3:3 Output: Equilateral Side1:10 Side2:10 Side3:1 Output: Isosceles Side1:3 Side2:4 Side3:5 Output: Scalene [Hint: Equilateral: All sides equal, Isosceles: Two sides equal, Scalene: All sides different] 2. Write a program that prompts the user to enter a letter and check whether the letter is a vowelor consonant. For a nonletter input, display invalid input. Here is a sample run: Enter a letter : B B is a consonant Enter a letter : a a is a vowel Enter a letter : # # is an invalid input 3. Write a program to calculate the train fare according to the below fare table. First 50 kms:3$/km 51-100 kms:2$/km >100 kms:1$/km Sample Run: Distance:80 Output:210$ (50*3+30*2) Distance:160 Output:310$ (50*3+50*2+60*1) 4. Write a program that accepts an input positive integer consisting of five digits from the user, separates the number into its individual digits and prints the digits separated from one another by three spaces each. For example, if the user types in the number 42339, the program should print 4 2 3 3 9. Assume that the user enters the correct number of digits. What happens when you execute the program and type a number with more than five digits? What happens when you execute the program and type a number with fewer than five digits? How will you modify your program to ignore the numbers with digits not equal to five? Part 1 import java.util.*; public class Part1 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Side1: "); int s1 = input.nextInt(); System.out.print("Side2: "); int s2 = input.nextInt(); System.out.print("Side3: "); int s3 = input.nextInt(); if ((s1 + s2) < s3 || (s2 + s3) < s1 || (s3 + s1) < s2) System.out.println("Invalid Input!"); else { if (s1 == s2 && s2 == s3) System.out.println("Equilateral"); else if (s1 == s2 || s2 == s3 || s3 == s1) System.out.println("Isosceles"); else System.out.println("Scalene"); } } } Part 2 import java.util.*; public class Part2 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter a letter: "); char l = input.next().charAt(0); char vowels[] = {'a', 'e', 'i', 'o', 'u'}; char lowerCase = Character.toLowerCase(l); if (lowerCase < 'a' || lowerCase > 'z') { System.out.println(l + " is an invalid input."); System.exit(0); } for (int i = 0; i < 5; i++) { if (lowerCase == vowels[i]) { System.out.println(l + " is a vowel."); System.exit(0); } } System.out.println(l + " is a consonant."); } } Part 3 import java.util.*; public class Part3 { public static void main(String[] args){ Scanner input = new Scanner(System.in); System.out.print("Distance: "); int d = input.nextInt(); int fare; String equation; if (d > 100) { d -= 100; fare = ((50*3 + 50*2) + d); equation = String.format("(50*3+50*2+%d*1)", d); } else if (d > 50) { d -= 50; fare = (50*3) + (d*2); equation = String.format("(50*3+%d*2)", d); } else { fare = d * 3; equation = String.format("%d*3", d); } System.out.println("Output: " + fare + "$" + equation); } } Part 4 import java.util.*; public class Part4 { public static void main(String[] args){ Scanner input = new Scanner(System.in); System.out.print("Enter an integer: "); int integer = input.nextInt(); while (true) { if (integer > 99999 || integer < 10000) { System.out.print("Enter an integer with 5 digits: "); integer = input.nextInt(); } else break; } for (int i = 4; i >= 0; i--) { int denominator = (int) Math.pow(10, (i)); int digit = integer / denominator; if (i == 0) System.out.print(digit + "."); else { System.out.print(digit + " "); integer -= digit * denominator; } } } } /* Code between line 8 and 14 is the modification that I made to my program. I use a while loop so that it will continuously ask the user for input until a 5-digit integer is entered. Then the loop breaks, and the following blocks of code is executed. Without this enhancement, if an integer with less than 5 digits is entered, for example 1234, then the output will be 0 1 2 3 4. "O" will replace the required number of digits starting from the left. If an integer with more than 5 digits is entered, for example 1234567, then the output will be 123 4 5 6 7. The starting digits of the integer will be placed together as ONE digit in order for the program to return exactly 5 digits. */