"check prime cpp gfg" Code Answer's

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check prime in c++

Weary Wolf on Dec 03, 2020

#include <bits/stdc++.h>
#include <math.h>
using namespace std;

#define ll long long

bool checkPrime(int number){
	for(int i=2; i<=sqrt(number); i++){
		if(number%i==0){
			return false;
		}
	}
	return true;
}

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C++ prime number check

Katonkel on Feb 21, 2021

// 6k+-1 optimisation
bool is_prime6(int num) {
  int i;
  if (num == 1)
    return false;
  if (num <= 3)
    return true;
  if (num % 2 == 0 || num % 3 == 0)
    return false;
  if (num < 25)
    return true;
  for (i = 5; i * i <= num; i += 6)
    if (num % i == 0 || num % (i + 2) == 0)
      return false;
  return true;
}

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check prime cpp gfg

master._.mind on May 11, 2021

bool isPrime(int s){
   if(s<=1)return false;
   if(s==2)return true;
   int m = ceil(sqrt(s));
   for(int i=2;i<=m;i++){
       if(s%i==0){
           return false;
       }
   }
   return true;
}

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check prime in c++

Weary Wolf on Dec 03, 2020

#include <bits/stdc++.h>
using namespace std;

#define ll long long
bool isPrime(ll number){
	  for(ll i = 2; i <= number / 2; i++){
	  
  
      	if(number % i == 0)
      {
          return false;
          break;
      }
 	}
 	
 	return true;
}

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"check prime cpp gfg" Code Answer's

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