Prob 4. Write a function called addThrees that inserts a 3 after each digit of a positive integer parameter. For example, a program that uses the function addThrees follows.

int main() {

cout << addThrees(3) << endl; // prints 33

cout << addThrees(1313) << endl; // prints 13331333

cout << addThrees(777) << endl; // prints 737373

return 0;

}

(just the function ); example-

(Answer: int removeLast7(int n) { if (n == 0) return 0;

if (n % 10 == 7) return n/10; return 10 * removeLast7(n/10) + n%10;)this is an example .