Floats and division by zero

Questions 1 to 5 of 8

1. 1. What does this program print? ``cpp #include <iostream> int main() { double zero = 0.0; double a = 1.0 / zero; double b = -1.0 / zero; std::cout << a << " " << b << " " << (a > 1e308) << "\n"; } ``

   inf -inf trueinf -inf 11 -1 1inf inf 1
2. 2. What does this program print? ``cpp #include <iostream> int main() { double x = 0.5 + 0.25; std::cout << std::boolalpha; std::cout << (x == 0.75) << " " << (0.1 + 0.2 == 0.3) << "\n"; } ``

   true true1 0true falsefalse false
3. 3. What does this program print? ``cpp #include <iostream> int main() { double big = 1e16; std::cout << std::boolalpha << (big + 1.0 == big) << "\n"; } ``

   truefalse110000000000000001
4. 4. Is this statement true? 0.1 + 0.2 == 0.3 is true in C++.

   True, because the sum rounds to exactly the stored value of 0.3False, because 0.1 + 0.2 is stored as 0.30000000000000004, which is the next stored value above the stored 0.3
5. 5. Is this statement true? 0.0 / 0.0 == 0.0 / 0.0 is true in C++, since both sides are the same division.

   False, because NaN is not equal to anything, including itselfTrue, because both sides are the same division and give the same result