From 94e2465ded436006cdd3f57dc6d4e3f733c28733 Mon Sep 17 00:00:00 2001
From: nasr <nsrddyn@gmail.com>
Date: Mon, 17 Nov 2025 23:57:36 +0100
Subject: feature(updatefeature(update): prime calculation method

finished the prime number calculation method,  added an example of it
calculating the max int number. stresses cpu usage to 100%, not heavy
yet. But we are stressing it in someway. next steps are to add
multithreading and different ways of performance measurments.
---
 src/main/scala/com/nsrddyn/cpu/ALU/Prime.scala | 38 +++++++-------------------
 1 file changed, 10 insertions(+), 28 deletions(-)

(limited to 'src/main/scala/com/nsrddyn/cpu')

diff --git a/src/main/scala/com/nsrddyn/cpu/ALU/Prime.scala b/src/main/scala/com/nsrddyn/cpu/ALU/Prime.scala
index 2ad3ba6..ca73e6b 100644
--- a/src/main/scala/com/nsrddyn/cpu/ALU/Prime.scala
+++ b/src/main/scala/com/nsrddyn/cpu/ALU/Prime.scala
@@ -4,6 +4,7 @@ package com.nsrddyn
 
 class Prime(threads: Int) {
 
+
   /*
    * Calculate all primes up to limit
    * This should stress the ALU in someway,
@@ -11,36 +12,17 @@ class Prime(threads: Int) {
    * will hopefully keep the cpu pipeline busy
    * and that way stress the branch predictor
    *
-   * */
-
-
-  // TODO: bad implementation of scala, scala prefers functional programming which  something I am not doing here
-
-  def run(n: Long): Unit = {
-
-
-    var iterator = 0
-
-    // TODO: run the isPrime checks
-
-  }
+   * math.sqrt(n) => a prime number has 2 factors, one of the factors 
+   * of the prime numbers has to be smaller then n 
+   * after that we check if the number is whole number and thereby checking if its a prime
+   *
+   */
 
   def isPrime(n: Int): Boolean = {
-
-    for 
-      i <- 2 to 5 
-      if isWholeNumber(n % i) == true then 
-        true
-    
-    false
-
-    // TODO: calculate  if the number is a prime number
-    // TODO: fix errors
+    if n <= 1 then false
+    else !(2 to math.sqrt(n).toInt).exists(i => n % i  == 0)
   }
 
-  def isWholeNumber(n: Int | Float): Boolean = {
-    // TODO: calculate if the number is a whole number
-  }
-
-
+  def run(n: Int): Unit = for i <- 0 to n do isPrime(i)
 }
+
-- 
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