//nest3.cpp, nested ifs, checking for valid data
#include <iostream>
using namespace std;
int main()
{
   int temp;
   bool warm;
   char ans;
   bool weekend;
   bool validData;
   cout << "What is the temperature? ";
   cin  >> temp;
   warm = (temp > 70);
   cout << "Is it a weekend (y/n): ";
   cin >> ans;
   weekend = ((ans=='y') || (ans=='Y'));
   validData = (((ans=='y') || (ans=='Y') ||  (ans=='n') || (ans=='N'))
            &&
                ((temp > 0) && (temp < 100)));
   if (validData)
   {
      if (weekend)
      {
         cout << "wear black dress." << endl;
      }
      else
      {
        if (warm)
           cout << "Wear t-shirt."<< endl;
        else
           cout << "Wear sweater" << endl;
      }
   }
   else
      cout << "Bad data"  << endl;
   return 0;
}