Răspuns:
using namespace std;
#include <iostream>
#include <stdlib.h>
#include <math.h>
int main() //programul principal
{
int i,cifra,numar;
numar=0;
for(i=1;i<=3;i++){
cout<<"Cifra "<<i<<" ";
cin>>cifra;
numar=numar*10+cifra;
}
cout<<"Numar :"<<numar;
}