$7\mathrm{.}21\mathrm{.}2$: Complete the program that reads numbers and return the sum of the inputs.

$577648\mathrm{.}3479862.$qx$3$zqy$7$

Complete the program below that reads numbers, prompting the user:

cout $<<$ "Enter an integer, Q to quit";

string input;

cin $>>$ input;

Return the sum of the inputs. You must use the library atoi function.