#include <iostream> using namespace std; int main() { int low, high, i, flag; cout << "Enter two numbers(intervals): "; cin >> low >> high; cout << "a;b " << low << " and " << high << " are: "; while (low < high) { flag = 0; for(i = 2; i <= low/2; ++i) { if(low % i == 0) { flag = 1; break; } } if (flag == 0) cout << low << " "; ++low; } return 0; }
Output: Enter two numbers(intervals): 20 50 Prime numbers between 20 and 50 are: 23 29 31 37 41 43 47