java program to print prime numbers 1 to 100 code example
Example 1: Java program to print prime numbers from 2 to n
import java.util.Scanner;
public class PrimeNumberFrom2Ton
{
public static void main(String[] args)
{
int loop, max;
System.out.print("Please enter highest (maximum) number: ");
Scanner sc = new Scanner(System.in);
max = sc.nextInt();
for(loop = 2; loop < max; ++loop)
{
if(findPrime(loop))
{
System.out.println(loop);
}
}
sc.close();
}
public static boolean findPrime(int number)
{
int a;
boolean boolPrime = true;
for(a = 2; a < number / 2; a++)
{
if(number%a == 0)
{
boolPrime = false;
break;
}
}
return boolPrime;
}
}
Example 2: Java program to display prime numbers from 1 to 100
public class PrimeNumbersFrom1To100
{
public static void main(String[] args)
{
int maxNumber = 100;
boolean prime = true;
String primeNumbers = "";
for(int a = 1; a <= maxNumber; a++)
{
prime = checkPrime(a);
if(prime)
{
primeNumbers = primeNumbers + a + " ";
}
}
System.out.println("Display prime numbers from 1 to " + maxNumber + ": ");
System.out.println(primeNumbers);
}
public static boolean checkPrime(int number)
{
int remainder;
for(int a = 2; a <= number / 2; a++)
{
remainder = number % a;
if(remainder == 0)
{
return false;
}
}
return true;
}
}