c 2b 2b program to generate prime numbers

1#include <iostream>
2using namespace std;
3
4int main()
5{
6  int n, i;
7  bool isPrime = true;
8
9  cout << "Enter a positive integer: ";
10  cin >> n;
11
12  for(i = 2; i <= n / 2; ++i)
13  {
14      if(n % i == 0)
15      {
16          isPrime = false;
17          break;
18      }
19  }
20  if (isPrime)
21      cout << "This is a prime number";
22  else
23      cout << "This is not a prime number";
24
25  return 0;
26}

1#include <iostream>
2using namespace std;
3
4int main() {
5    int low, high, i;
6    bool isPrime = true;
7
8    cout << "Enter two numbers (intervals): ";
9    cin >> low >> high;
10
11    cout << "\nPrime numbers between " << low << " and " << high << " are: " << endl;
12
13    while (low < high) {
14        isPrime = true;
15        if (low == 0 || low == 1) {
16            isPrime = false;
17        }
18        else {
19            for (i = 2; i <= low / 2; ++i) {
20                if (low % i == 0) {
21                    isPrime = false;
22                    break;
23                }
24            }
25        }
26        
27        if (isPrime)
28            cout << low << " ";
29
30        ++low;
31    }
32
33    return 0;
34}
35