Operator review

Questions 1 to 5 of 6

1. 1. Match each expression to its value. Use the floor_div and floor_mod helpers from the floor division lesson, where floor_div rounds toward negative infinity and floor_mod gives a result with the sign of the divisor.

   Choose the matching item for each row.

   -7 / 2Choose…-41-1-3-7 % 2Choose…-41-1-3floor_div(-7, 2)Choose…-41-1-3floor_mod(-7, 2)Choose…-41-1-3
2. 2. Match each bit expression to what it does to a value x. Here k is a bit position.

   Choose the matching item for each row.

   1u << kChoose…x with its lowest set bit removedx with bit k clearedx with bit k flippeda mask with only bit k setx & (x - 1)Choose…x with its lowest set bit removedx with bit k clearedx with bit k flippeda mask with only bit k setx & ~(1u << k)Choose…x with its lowest set bit removedx with bit k clearedx with bit k flippeda mask with only bit k setx ^ (1u << k)Choose…x with its lowest set bit removedx with bit k clearedx with bit k flippeda mask with only bit k set
3. 3. A function next_id(int& counter) adds 1 to counter and returns the new value. With int c = 0;, what does this line print in C++17 or later? ``cpp cout << next_id(c) << " " << next_id(c); ``

   2 11 11 2undefined, because the two calls have no fixed order
4. 4. Which expression gives -4?

   -7 % 2floor(-7 / 2)-7 / 2floor(-7 / 2.0)
5. 5. What does this program print? Each value is separated by a space. ``cpp #include <iostream> int main() { int a = -13; std::cout << a / 5 << " " << a % 5 << " " << 13 % -5 << "\n"; } ``

   -2 -3 -3-2 -3 3-3 -2 -3-2 3 -3