Answered: A prime number is a number that is…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Java Program

Chapter 5. PC #13. is Prime Method

A prime number is a number that is evenly divisible only by itself and 1. For example, the number 5 is prime because it can be evenly divided only by 1 and 5. The number 6, however, is not prime because it can be divided evenly by 1, 2, 3, and 6. Write a method named isPrime, which takes an integer as an argument and returns true if the argument is a prime number, or false otherwise. Demonstrate the method in a complete program. The program should ask the user to enter a number for primality test or a negative number to exit.

Tip: Recall that the % operator divides one number by another, and returns the remainder of the division. In an expression such as num1 % num2, the % operator will return 0 if num1 is evenly divisible by num2. I do not want a goodbye system out in the program and it has to pass all the test cases.

Test Case 1

Please enter a number to check for primality or -1 to exit:\n
2ENTER
2 is a prime number.\n
Please enter a number to check for primality or -1 to exit:\n
3ENTER
3 is a prime number.\n
Please enter a number to check for primality or -1 to exit:\n
4ENTER
4 is not a prime number.\n
Please enter a number to check for primality or -1 to exit:\n
25ENTER
25 is not a prime number.\n
Please enter a number to check for primality or -1 to exit:\n
101ENTER
101 is a prime number.\n
Please enter a number to check for primality or -1 to exit:\n
-1ENTER

Test Case 2

Please enter a number to check for primality or -1 to exit:\n
-10ENTER
Invalid input.\n
Please enter a number to check for primality or -1 to exit:\n
0ENTER
Invalid input.\n
Please enter a number to check for primality or -1 to exit:\n
2ENTER
2 is a prime number.\n
Please enter a number to check for primality or -1 to exit:\n
-1ENTER

Expert Solution

Step 1: Introduction

The below program checks if the number entered by the user is a prime number or not. The program prompts the user to enter a number for primality test or a negative number to exit. If the entered number is valid the program will output if the number is a prime number or not. If the number entered is negative or 0, it prompts the user to enter a valid number. The method isPrime returns true if the argument is a prime number or false otherwise. A while loop is used to keep prompting the user until -1 is entered.

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