#include <iostream>
#include <cstdlib>
using namespace std;
const int SIZE = 20;

int fill_array(int num1[], int SIZE);
int fill_array2(int num2[], int sum, int SIZE);
int add_arrays(int num1[], int num2[], int sum, int SIZE);

int fill_array(int num1[], int SIZE)
{
  int next;
  cout << "Enter a number with up to 20 digits followed by a period: ";
  cin >> next;
  int i;
  for (i=0; i<SIZE; i++)
    {
      cin >> next;
      if(next == '.')
	{
	  break;
	}
      num1[i]=next;
    }
  return i;
}

int fill_array2(int num2[], int SIZE)
{
  int nextt;
  cout << "Enter another number with up to 20 digits followed by a period: ";
  cin >> nextt;
  int j;
  for (j=0; j<SIZE; j++)
    {
      cin >> nextt;
      if(nextt == '.')
	{
	  break;
	}
      num2[j]=nextt;
    }
  return j;
}

int main()
{
  int num1[SIZE], num2[SIZE];
  fill_array(num1, SIZE);
  fill_array2(num2, SIZE);
  return 0;
}

#include <cstdio>
int main()
{
  char  ns1[20]=                 {'4','5','8','9', '\0'},
        ns2[20]= {'4','5','8','9','2','6','3','5', '\0'};
        /* expect: 4   5   8   9   7   2   2   4       */    
   int num1= 0, num2= 0;

  num1 = chars_to_int(ns1);  /* design your function to fill this requirement */
  /* etc ...  */
  return 0;
}