Count and add P71649

Write a procedure

    void count_and_add(int& num, int& sum);

to read a sequence of integer numbers until its end, and store in @num@ how many numbers it has, and store in @sum@ the sum of those numbers. For instance, if the input sequence is

10 -3 23

the values after the call must be @num@ $= 3$ and @sum@ $= 30$.

Observation

You only need to submit the required procedure; your main program will be ignored.