Help Moc

#include <iostream>

using namespace std;

int main()
{
    char numar[30];
    cout <<"Introduceti numarul: "; cin >> numar;
    if(!numar[1]){
        cout << "Numarul trebuie sa aiba doua cfire ce-l putin";
        return 0 ;
    }
    for( int i = 0;  ; ++i)
    if(!numar[i+1] || numar[i] < numar[i + 1]){
        numar[i] = '\0';
        cout << numar << numar + i + 1;
        break;
    }

    return 0;
}