check prime in c++
#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;
}check prime in c++
#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;
}C++ prime number check
// 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;
}check prime cpp gfg
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;
}check prime in c++
#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;
}Copyright © 2021 Codeinu
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