Question

2. Consider the following recursive function (Chapter 17, #9, modified) void recFun (int x) { if (x > 10) { recFun (x / 10); cout<< X % 10; } else cout<< x; } a) What is printed by the call: recFun (268); b) How can the code be modified so that when a number is input, its digits are printed on separate lines? c) How can the code be modified so that the sum of all digits is printed?

Answer 1

The recFun() prints the digits of the number that is passed. So whatever number is passed, it prints the same number .

Answer a) The call recFun(268) prints 268

Answer b) To print the digits one on each line, we can modify the function as follows-
int recFun(int x)
{
   int sum = 0;
   if(x > 0)
   {
       int sum = recFun(x/10) + x%10;
   }
   else
       sum = x;
   cout << sum << endl;
}

Answer c) To print the sum of digits, the code can be modified as follows-
int recFun(int x, int sum = 0)
{
   if(x <= 9)
       cout << x+sum << endl;
   else
       recFun(x / 10, sum+x%10);
}