Download Assignment 2

COP 2210 sections 5, 6 & 7
Assignment 2: Prime Factors
Due Date: February 27, at the beginning of the class. Late assignments will not be
accepted.
The program must be completed in groups of two students. You can’t work with the same
person you worked with for assignment 1. Your printout must names of both members of
your teams. Teams of less or more than 2 students are not accepted. Turn in a printout of
your program and sample output
A prime number is a number that is only divisible by 1 and the number itself. For
example 5, 7, 11, 19 and 123 are prime numbers but 8 is not a prime number.
Write a program that reads a sequence of integer numbers (larger than 1) and displays the
input numbers’ prime factors. The following are a few input/output examples:
Input
12
15
28
5
Output
2
2
3
3
5
2
2
7
5
Your program must contain the following methods
public static boolean isPrime(int m)
Accepts one integer parameter, m, and returns
true, if m is a prime number. Otherwise, isPrime
returns false.
For example, isPrime(72) returns false, whereas
isPrime(11) returns true;
public static int nextPrime(int m)
Accepts one integer parameter, m and returns
the first prime number that is larger than m.
For example nextPrime(6) will return 7 and
nextPrime(27) returns 29
The main method must:
1. Prompt the user for an input number with a meaningful message.
2. If the input value is less than or equal to 1, the user must be informed of
the error in the input, and then be prompted for another input
3. If more than three consecutive erroneous input values are entered, the
program must be terminated with an appropriate error message
4. If the input is larger than 1, then its prime factors must be displayed
5. After displaying the prime factors, the program must ask whether or not
the user wants to enter another input (Do you want to continue? (y/n))
6. The user must answer either yes, no, y or n using any combination of
lower and upper case letters.
7. If an invalid answer is given, the user must be informed that the answer
was not acceptable, and then be prompted again for another answer.
8. If more than three consecutive erroneous answers are given, the program
must be terminated with an appropriate error message.
9. If the answer in step 6, is Yes (in any allowed form) the program must
continue from step 1.
10. If the answer is No (in any allowed form) the program must terminate with
a message informing that the program is terminated normally.
11. All input must be done using an Scanner object i.e.
Scanner inp = new Scanner (System.in);
12. All output should be done using System.out.