misc/test.cpp


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#include <iostream>
#include <iomanip>
#include <math.h>
using namespace std;

int main () {
  unsigned long long x;
  int a;
  cout << "Enter a number:";
  cin >> x;
  unsigned long long i = (x-1);
  
  for (i=x; i>1; --i/*--*/) {
    if (x%i==0 && x!=i) {
      cout << "Not prime!" << endl;
      a=1700;
      break;
      return 3;
    }
  }
  
  if (a!=1700)
  cout << "Prime!" << endl;
  return 0;
}