#include <iostream>
#include <string>
using namespace std;

int main(){
  char a, b, c;
  cout<<"Enter a 3 digit number:" << endl;

  cin>> a >> b >> c;

  while(cin != 'n'){
    cout<< "3 digits only" << endl;
  }
  cout<< a << " " << b << " " << c << endl;

  string num;
  cout<<"Enter a any digit number:" << endl;
  cin>> num;

  char* array = &num[0];
  int total = num.length();

  for(int i = 0; i < total; i++){
    cout<<  array[i]  << " ";
  }

}

Enter a 3 digit number:
123
1 2 3
Enter a any digit number:
191843564
1 9 1 8 4 3 5 6 4 %