java program to print range of prime numbers upto given number code example
Example 1: Java program to print prime numbers in a given range
public class PrimeNumberRangeDemo
{
public static void main(String[] args)
{
int lowerRange = 10, higherRange = 50;
while(lowerRange < higherRange)
{
boolean flag = false;
for(int a = 2; a <= lowerRange / 2; ++a)
{
if(lowerRange % a == 0)
{
flag = true;
break;
}
}
if(!flag && lowerRange != 0 && lowerRange != 1)
System.out.print(lowerRange + " ");
++lowerRange;
}
}
}
Example 2: Java program to print prime numbers upto n
import java.util.Scanner;
public class PrimeNumberUptoN
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
int a = 0;
int n = 0;
String strPrime = "";
System.out.println("Please enter the value of n: ");
int number = sc.nextInt();
for(a = 1; a <= number; a++)
{
int counter = 0;
for(n = a; n >= 1; n--)
{
if(a % n == 0)
{
counter = counter + 1;
}
}
if(counter == 2)
{
strPrime = strPrime + a + " ";
}
}
System.out.println("prime numbers upto n are: ");
System.out.println(strPrime);
sc.close();
}
}