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#include <iostream>
using namespace std;
int main ()
{
	int a, somma=0;
	bool decimale=false;
	cin>>a;
 
	if (a == -1)
	{
		cout<<"VUOTO";
	}
	else 
	{
		while (a != -1)
		{
			somma=(somma*10)+a;
 
			if (a>=0 && a<=9)
				decimale=true;
 
				cin>>a;
		}
 
		if (decimale==false)
			cout<<"ERRORE";
 
		if else (decimale==true && somma%3==0)
			cout<<somma<<"SI";
		else
			cout<<somma<<"NO";
	}
 
   return 0;
}

prog.cpp:28:6: error: expected '(' after 'if'
                if else (decimale==true && somma%3==0)
                   ^
prog.cpp:30:3: error: expected expression
                else
                ^
2 errors generated.

Standard output is empty