    #include <iostream>
    #include <string>

    using namespace std;

    int main()
    {
       cout << "Enter a magnitude on the Richter scale: ";
       double richter;
       cin >> richter;

       if (richter >= 8.0)
          cout << "Most structures fall\n";
       else if (richter >= 7.0)
          cout << "Many buildings destroyed\n";
       else if (richter >= 6.0)
          cout << "Many buildings considerably damaged, "
             << "some collapse\n";
       else if (richter >= 4.5)
          cout << "Damage to poorly constructed buildings\n";
       else if (richter >= 3.5)
          cout << "Felt by many people, no destruction\n";
       else if (richter >= 0)
          cout << "Generally not felt by people\n";
       else
          cout << "Negative numbers are not valid\n";
       return 0;
    }