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#include <iostream>

using namespace std;

int main()
{
    float x,y;
    int n;
    do {
        cout<<"Unesi broj: ";
        cin>>x;
        y += x;
        n++;
        if ( x == 0 ) {
           n--;
           y = y / n;
           break;
        }
    } while (x!=0);
    cout<<"Uneseno je "<<n<<" brojeva."<<" Srednja vrijednost je: "<<y;
    return 0;
}