Prime Numbers
if (n <= 1) {
return false;
}
for (int i = 2; i < Math.sqrt(n); i++) {
if (n % i == 0) {
return false;
}
}
return true;
}
Public class PrimeNumbers {
Public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print(“Enter a number : “);
int n = s.nextInt();
if (isPrime(n)) {
System.out.println(n + ” is a prime number”);
} else {
System.out.println(n + ” is not a prime number”);
}
}
Public static boolean isPrime(int n) {
if (n <= 1) {
return false;
}
for (int i = 2; i < Math.sqrt(n); i++) {
if (n % i == 0) {
return false;
}
}
return true;
}
}
7 is a prime number
Enter a number : 34
34 is not a prime number
Public class PrimeNumbers {
Public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print(“Enter the first number number : “);
int start = s.nextInt();
System.out.print(“Enter the second number number : “);
int end = s.nextInt();
System.out.println(“List of prime numbers between ” + start + ” and ” + end);
for (int i = start; i <= end; i++) {
if (isPrime(i)) {
System.out.println(i);
}
}
}
Public static boolean isPrime(int n) {
if (n <= 1) {
return false;
}
for (int i = 2; i < Math.sqrt(n); i++) {
if (n % i == 0) {
return false;
}
}
return true;
}
}
Enter the second number number : 10
List of prime numbers between 2 and 10
2
3
4
5
7
9