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;
}program to know if a number is prime
#include<bits/stdc++.h>
using namespace std;
bool Is_Prime(long long x){
if(x%2==0)return false;
for(int i=3;i*i<=x;i+=2)
if(x%i==0)return false;
return true;
}
int main(){
long long x;
cin>>x;
if(Is_Prime(x))cout<<"Is Prime";
else cout<<"Is not Prime";
}Copyright © 2021 Codeinu
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