Write a function name isPrime, which takes an integer as an argument and returns true if the argument is a prime number, or false otherwise. Demonstrate the function in a complete program that prompts for a number and indicates whether or not it is prime.

Question

Computers and Technology

Jayla Le

17 July, 00:26

Write a function name isPrime, which takes an integer as an argument and returns true if the argument is a prime number, or false otherwise. Demonstrate the function in a complete program that prompts for a number and indicates whether or not it is prime.

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Answers (1)

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Jovany Medina · Answer 1

public static boolean isPrime (int number)

{

if (number<1)

return false;

else if (number = = 1||number = =2 ||number==3)

{

return true;

}

else

{

for (int i=2; i
{

if (number%i==0)

return false;

}

return true;

}

}

The complete program is given in the explanation section

Explanation:

import java. util. Scanner;

public class PrimeNumber {

public static boolean isPrime (int number)

{

if (number<1)

return false;

else if (number = = 1||number = =2 ||number==3)

{

return true;

}

else

{

for (int i=2; i
{

if (number%i==0)

return false;

}

return true;

}

}

public static void main (String[] args) {

Scanner in = new Scanner (System. in);

System. out. println ("Enter a number to check if it is Prime");

int num = in. nextInt ();

if (isPrime (num)) {

System. out. println ("The number "+num+" is a prime number");

}

else {

System. out. println ("The number "+num+" is NOT a prime number");

}

}

}

Prime numbers are numbers divisible only by themselves and 1 Examples are: (2, 3, 5, 7, 11)