Write a program which take a number as input from the user and tells whether the number is prime no or not. in c++ code example
Example 1: c++ find prime numbers
#include
using namespace std;
int main()
{
int n, i;
bool isPrime = true;
cout << "Enter a positive integer: ";
cin >> n;
for(i = 2; i <= n / 2; ++i)
{
if(n % i == 0)
{
isPrime = false;
break;
}
}
if (isPrime)
cout << "This is a prime number";
else
cout << "This is not a prime number";
return 0;
}
Example 2: check prime in c++
#include
#include
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;
}
Example 3: check prime in c++
#include
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;
}