Please explain answer

18. (8 pts) For the following code segment, write out what is printed to the screen. Show the displayed output precisely by using the following rules o Write one character per box o Skip a box to indicate the presence of a blank space in the output. o Skip a row to indicate the presence of a blank line in the output. #include using namespace std void Sum (int&); int main () int add4; Sum (add); Sum (add); Sum (add); Sum (add); return 0; void Sum (int& add) int sum- static int j1; sum sum + add; cout