#include <iostream>      using namespace std;      int main()      {         double a,b,s;         cout<<"vvedite 2 chisla: ";         cin>>a>>b;         if (a<0.5, b>2){             cout<<"error";              return 0;         }         else         s=a*b;         cout<<a<<"*"<<b<<"="<<s<<endl;         return 0;      }