CS141 Programming Assignment #6

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1 CS141 Programming Assignment #6 Due Sunday, Nov 18th. 1) Write a class with methods to do the following output: a) b) * * * * * * * * * * * * * * * * * * * * * * * * * c) Read odd integer x and the output depended on x for example: x = 5 x=7 * * *** *** ***** ***** *** ******* * ***** *** * Solution: Student name Student ID Assignment #6 Question #1 141/51 Computer Programming I Due date: November 18, 2012 Program to output three different shapes: and * * * * * * * * * * * * * * * * * * * * * * * * * and enter an odd integer and print a shape similar to the following where the diameter has the same number of stars as the odd number entered e.g. if the number entered is 7 then it prints: * *** ***** ******* ***** *** *

2 import java.util.scanner; public class a6q1 public static void main(string[] args) methoda(); methodb(); System.out.print("Enter an odd integer: "); int num = input.nextint(); methodc(num); /* Method to print the first shape mentioned above */ public static void methoda () for (int i = 5; i >= 1; i--) for (int j = 5; j > i; j--) System.out.print( " " ); System.out.print(i+" "); /* Method to print the second shape mentioned above */ public static void methodb() for (int i = 5; i >= 1; i--) for (int j = i; j < 5; j++) for (int j = i; j < 4; j++) for (int j = i; j >= 1; j--) if (j == 5) continue; for (int i = 2; i <= 5; i++) for (int j = i; j < 5; j++) for (int j = i; j < 4; j++) for (int j = i; j >= 1; j--) if (j == 5) continue;

3 /* Method to print the third shape mentioned above */ public static void methodc(int x) if(x%2!= 0) for (int i = 1; i <= x; i+=2) for (int j = 1; j <= (x - i)/2; j++) System.out.print(" "); System.out.print("*"); else for (int i = x-2; i >= 1; i-=2) for (int j = 1; j <= (x - i)/2; j++) System.out.print(" "); System.out.print("*"); System.out.printf("Error!! %d is not odd!!", x); 2) Write a program that have a menu of 4 options: Please choose from the menu: 1- Print a number digits 2- Calculate the sum between two integers 3- Find all numbers divisible by a number in a given range 4- Exit Option 1 asks for a positive integer number n and prints its digits. Example: Please enter a positive integer: = Option 2 asks for two integers start and end then it finds the sum of all the integers between start and end. Example: Please enter the start and the end integers: 2 6 The sum for all numbers between 2 and 6 = 12 Option 3 asks for three integers start, end and a number then it finds those integers between start and end that are divisible by the number and prints them. Example: Please enter the start and the end integers: 1 10 Please enter the number you want to check for: 3 The numbers are divisible by 3 is : Option 4 Exit the program.

4 Solution: Student name Student ID Assignment #6 Question #1 141/51 Computer Programming I Due date: November 18, 2012 Menu driven program to either: print a given number's digits calculate the sum between two integers or find all numbers divisible by a number in a given range import java.util.scanner; public class a6q2 public static void main(string[] args) int choice; stores the user's choice from the menu do System.out.println("Please choose from the menu:\n"); System.out.println(" 1- Print the number's digits"); System.out.println(" 2- Calculate the sum between two integers"); System.out.println(" 3- Find all numbers divisible by a number" + " in a given range"); System.out.println(" 4- Exit"); choice = input.nextint(); switch(choice) while (choice!= 4); case 1: printdigits(); case 2: printsum(); case 3: printdivisors(); case 4: default:system.out.println("invalid input. Try again!!"); /* method to print the digits in the number */ public static void printdigits() Scanner input = new Scanner (System.in); int num; stores the integer number to print the digits of System.out.println("Please enter a positive integer: "); num = input.nextint(); System.out.printf("%d=", num); while(num >0) System.out.printf(" %d", num%10); num/=10;

5 /* method to print the sum of numbers between a range */ public static void printsum() int start; stores the starting value of the range int end; stores the ending value of the range int sum = 0; stores the sum of the value between the range System.out.println("Please enter the start and the end integers:"); start = input.nextint(); end = input.nextint(); for (int i = start+1; i < end; i++) sum += i; System.out.printf("The sum for all numbers between %d ", start); System.out.printf("and % d = %d\n", end, sum); /* method to find the numbers divisible by a certain number */ /* between a specific range */ public static void printdivisors() Scanner input = new Scanner (System.in); int start; int end; int num; stores the beginning of the range stores the end of the range stores the number to check for divisibility of System.out.println("Please enter the start and end integers:"); start = input.nextint(); end = input.nextint(); System.out.println("Please enter the number you want to check for:"); num = input.nextint(); System.out.printf("The numbers are divisible by %d is:\n", num); for (int i = start+1; i < end; i++) if (i % num == 0) System.out.printf("%d ", i);

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