Prime number program in java using scanner code example
Example 1: Prime number program in java using scanner
import java.util.Scanner;
public class PrimeNumberUsingScanner
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
System.out.println("Please enter a number to check prime number: ");
int number = sc.nextInt();
if(checkPrimeNumber(number))
{
System.out.println(number + " is a prime number");
}
else
{
System.out.println(number + " is not a prime number");
}
sc.close();
}
public static boolean checkPrimeNumber(int number)
{
if(number <= 1)
{
return false;
}
for(int a = 2; a < Math.sqrt(number); a++)
{
if(number % a == 0)
{
return false;
}
}
return true;
}
}
Example 2: prime number program in java
public class Prime {
public static void main(String[] args) {
int num = 29;
boolean flag = false;
for(int i = 2; i <= num/2; ++i){
if(num % i == 0){
flag = true;
break;
}
}
if (!flag)
System.out.println(num + " is a prime number.");
else
System.out.println(num + " is not a prime number.");
}}
Example 3: prime in java
public class Prime {
public static void main(String[] args) {
int num = 29;
boolean flag = false;
for(int i = 2; i <= num/2; ++i){
if(num % i == 0){
flag = true;
break;
}
}
if (!flag)
System.out.println(num + " is a prime number.");
else
System.out.println(num + " is not a prime number.");
}}
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