Java Program to impress prime numbers from one to 100

In this article, I'll part yous a elementary occupation almost writing a Java plan to impress prime numbers upward to a given position out e.g. country prime numbers from 1 to 100. It's 1 of the most mutual coding exercises for programmers learning inward Java, every bit it gives yous an chance to larn to a greater extent than almost essential operator inward Java Programming. The fundamental hither is that yous cannot purpose a library business office which tin only your job, yous take to devise the algorithm for checking prime position out past times yourself. One of the most pop algorithm for generating prime is Sieve of Eratosthenes, which nosotros guide keep discussed earlier, but inward this post, nosotros volition accept a simpler approach. We'll rootage write a business office to banking concern stand upward for whether a position out is prime or non as well as hence nosotros loop through rootage 100 numbers i.e. from 1 to 100 as well as impress solely those which passed the prime test. Btw, if yous are looking for about serious programming coding inquiry for the interview, hence yous tin too accept a hold back at Cracking the coding interview, which contains to a greater extent than than 150 coding inquiry alongside solutions.

How to banking concern stand upward for if a position out is prime or not

Influenza A virus subtype H5N1 position out is said to endure prime if it's non divisible past times whatsoever position out other than itself e.g. 2, iii or 5. 1 is non counted every bit a prime number, hence the lowest prime position out is 2. One of the easiest agency to banking concern stand upward for whether a position out is prime or not is to loop from 2 to the position out itself as well as checks if it's divisible past times whatsoever position out inward betwixt or not.

You tin produce that banking concern stand upward for past times using modulus operator inward Java, which furnish zero if a position out is perfectly divisible past times about other number. If the position out yous are checking is non divisible past times anyone hence it's a prime position out otherwise, it's non a prime number.

But this logic tin endure farther optimized to solely loop through the foursquare root of the position out instead of the position out itself, every bit shown inward below example. This volition brand the Java plan fast for checking large prime numbers.

Here is a listing of all prime numbers betwixt 1 as well as 100:

ll part yous a elementary occupation almost writing a Java plan to impress prime numbers upward to a Java Program to impress prime numbers from 1 to 100

An optimized agency to generate Prime numbers from 1 to 100

/**  * Java Program to impress prime numbers from 1 to 100  *  * @author Javin Paul  */ public class PrimeNumberGenerator {      public static void main(String args[]) {          // impress prime numbers from 1 - 100         System.out.println("Prime numbers from 1 to 100 ");          for (int i = 2; i <= 100; i++) {             if (isPrime(i)) {                 System.out.println(i);             }         }     }      /*      * An optimized to banking concern stand upward for if a position out is prime or not.      */     public static boolean isPrime(int num) {         if (num == 2 || num == 3) {             return true;         }          if (num % 2 == 0 || num % 3 == 0) {             return false;         }          for (int i = 3; i < Math.sqrt(num); i += 2) {             if (num % i == 0 || num % Math.sqrt(num) == 0) {                 return false;             }         }         return true;      } }  Output: Prime numbers from 1 to 100  2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

That's all almost how to impress prime numbers inward Java from 1 to 100. Let me know if yous discovery whatsoever põrnikas on this plan or yous intend if this plan volition non run inward whatsoever specific scenario. This looks much to a greater extent than optimized than looping till the position out itself.

Here are couplet of to a greater extent than coding problems for practice:

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