#include <iostream>

using namespace std;

int main() {

     int i{0};
     int startValue{0},
         endValue{0};

     cout << "Enter an end value: ";
     cin >> endValue;

     i = 1;

     while ( i <= endValue ) {
        cout << i << " ";
        i++;
     }
     cout << endl;

     cout << "In reverse" << endl;

     i = endValue;
     while( i > 0) {
        cout << i << " ";
        i--;
     }
     cout << endl;

     cout << endl;

     cout << "Enter the start value: ";
     cin >> startValue;

     if (startValue >= endValue) {
         i = startValue;
         while ( i >= endValue) {
             cout << i << " ";
             i--;
         }
     } else {
         i = startValue;
         while (i <= endValue) {
             cout << i << " ";
             i++;
         }
     }

     cout << endl;

     return 0;
}