Write the codeWrite a Java Program that prints out all prime numbers within a given integerSample Test CasesTest Case 1:Expected Output:Enter·an·integer:·5Prime·numbers·within·5:2·3·5·Test Case 2:Expected Output:Enter·an·integer:·30Prime·numbers·within·30:2·3·5·7·11·13·17·19·23·29·
Question
Write the codeWrite a Java Program that prints out all prime numbers within a given integerSample Test CasesTest Case 1:Expected Output:Enter·an·integer:·5Prime·numbers·within·5:2·3·5·Test Case 2:Expected Output:Enter·an·integer:·30Prime·numbers·within·30:2·3·5·7·11·13·17·19·23·29·
Solution
Here is a simple Java program that prints out all prime numbers within a given integer:
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Enter an integer: ");
int num = scanner.nextInt();
System.out.println("Prime numbers within " + num + ":");
for (int i = 2; i <= num; i++) {
if (isPrime(i)) {
System.out.print(i + " ");
}
}
}
public static boolean isPrime(int n) {
if (n <= 1) {
return false;
}
for (int i = 2; i < Math.sqrt(n) + 1; i++) {
if (n % i == 0) {
return false;
}
}
return true;
}
}
This program works as follows:
- It prompts the user to enter an integer.
- It then checks every number from 2 up to the entered integer to see if it's a prime number.
- If the number is prime, it prints it out.
- The
isPrimemethod checks if a number is prime by checking if it has any divisors other than 1 and itself. If it does, it's not prime. If it doesn't, it is prime.
Similar Questions
prime number in java
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