Dev - C++ - Establecer cuantos numeros debe intruducir

#include<iostream>

using namespace std;

int main ()

{

	int n,n1,n2,n3,n4,n5,n6,n7,n8,n9,sn1,sn2,sn3,sn4,sn5,sn6,sn7,sn8,sn9,sumatt,div,mult,rest;

	cout<<"Escriba un numero de 9 dijitos   ";

	cin>>n;

	n1=n/100000000;

	cout<<n1<<"   ";

	n2=n/10000000%10;

	cout<<n2<<"   ";

	n3=n/1000000%10;

	cout<<n3<<"   ";

	n4=n/100000%10;

	cout<<n4<<"   ";

	n5=n/10000%10;

	cout<<n5<<"   ";

	n6=n/1000%10;

	cout<<n6<<"   ";

	n7=n/100%10;

	cout<<n7<<"   ";

	n8=n/10%10;

	cout<<n8<<"   ";

	n9=n%10;

	cout<<n9<<"   "<<endl;

	    sn1=n1*10;

		sn2=n2*9;

		sn3=n3*8;

		sn4=n4*7;

		sn5=n5*6;

		sn6=n6*5;

		sn7=n7*4;

		sn8=n8*3;

		sn9=n9*2;

		sumatt=sn1+sn2+sn3+sn4+sn5+sn6+sn7+sn8+sn9;

	    cout<<"LA SUMA ES: "<<sumatt<<endl;

	    div=sumatt/11;

	    cout<<"LA DIVISION ES: "<<div<<endl;

	    mult=div*11;

	    cout<<"LA MULTIPLICACON: "<<mult<<endl;

	    rest=sumatt-mult;

	    cout<<"VALOR: "<<rest<<endl;

	//cout << "La suma de los digitos es: " << n1*10 << endl;

	//cout<<d+q+w+e+r<<"   ";

	return 0;

}

#include <iostream>

using namespace std;

int main()

{

    int numero;

    cout << "Entero de 9 digitos: ";

    cin >> numero;

    if( numero < 100000000 || numero > 999999999 )

        cout << "\nValor no valido" << endl;

    else

        cout << "\nEl numero es " << numero << endl;

    return 0;

}