Java program to print prime numbers in a given range
// 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;
}
}
}
4
4
// 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;
}
}
Thank you!
4
0
4.67
3
Now let’s see print first 10 prime numbers in java.
public class FirstTenPrimeNumbers
{
public static void main(String[] args)
{
int count = 0, number = 0, a = 1, b = 1;
while(number < 10)
{
b = 1;
count = 0;
while(b <= a)
{
if(a%b == 0)
count++;
b++;
}
if(count == 2)
{
System.out.printf("%d ", a);
number++;
}
a++;
}
}
}
Thank you!
3
0
3.8
5
// 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();
}
}
Thank you!
5
0
4.2
10
It will display the prime numbers between 1 and 100.
class PrimeNumbers
{
public static void main (String[] args)
{
int i =0;
int num =0;
//Empty String
String primeNumbers = "";
for (i = 1; i <= 100; i++)
{
int counter=0;
for(num =i; num>=1; num--)
{
if(i%num==0)
{
counter = counter + 1;
}
}
if (counter ==2)
{
//Appended the Prime number to the String
primeNumbers = primeNumbers + i + " ";
}
}
System.out.println("Prime numbers from 1 to 100 are :");
System.out.println(primeNumbers);
}
}
Thank you!
10
0
3.8
5
class PrimeNumbers
{
public static void main (String[] args)
{
int i =0;
int num =0;
//Empty String
String primeNumbers = "";
for (i = 1; i <= 100; i++)
{
int counter=0;
for(num =i; num>=1; num--)
{
if(i%num==0)
{
counter = counter + 1;
}
}
if (counter ==2)
{
//Appended the Prime number to the String
primeNumbers = primeNumbers + i + " ";
}
}
System.out.println("Prime numbers from 1 to 100 are :");
System.out.println(primeNumbers);
}
}
Thank you!
5
0
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