Write an expression that executes the loop while the user enters a number greater than or equal to 0.

note: these activities may test code with different test values. this activity will perform three tests, with usernum initially 9 and user input of 5, 2, -1, then with usernum initially 0 and user input of -17, then with usernum initially -1. see "how to use zybooks".

also note: if the submitted code has an infinite loop, the system will stop running the code after a few seconds, and report "program end never reached." the system doesn't print the test case that caused the reported message.

#include
using namespace std;

int main() {
int usernum;

usernum = 9;

while (/* your solution goes here */) {
cout < < "body" < < endl;
cin > > usernum;
}
cout < < "done." < < endl;

return 0;
}