-= #1 =-
#include

using namespace std;

int main()
{
  const double PI = 3,1415926535;
  int radius;

  cout << "Enter the radius: ";
  cin >> radius;

  cout << "The length of the circle = " << 2 * PI * radius << endl;

  system("pause");
  return 0;
}

-= #2 =-
#include

#define _MAX(a, b) ((a) > (b) ? (a) : (b))
#define _MIN(a, b) ((a) < (b) ? (a) : (b))

using namespace std;

int main()
{
  int value1, value2, value3;

  cout << "Enter the numbers: ";
  cin >> value1 >> value2 >> value3;

  int sum = _MAX(value1, _MAX(value2, value3)) + _MIN(value1, _MIN(value2, value3));
  sum *= sum;

  cout << sum << endl;

  system("pause");
  return 0;
}

-= #3 =-
#include

using namespace std;

int main()
{
  for (int i = 100; i <= 200; i++)
    if (i % 3 == 0 && i % 2 != 0)
      cout << i << "; ";
  cout << endl;

  system("pause");
  return 0;
}