Salut.Uite aici o modalitate. Succes!
#include <iostream>
using namespace std;
int main()
{
int n,x,c;
int k;
cin>>n;
x=n;
do
{
k=0;
while(x!=0)
{
c=x%10;
if(c==1)
k++;
x=x/10;
}
cout<<"Nr."<<n<<" Cifra(1): "<<k<<endl;
cin>>n;x=n;
}while(n!='\n');
return 0;
}