cout

No ability to write standard template library-based C++ code from memory, except maybe cout and cin.

The C++ code even uses printf instead of cout, which is one area where I would expect a difference.

I think people assume that because their vote doesn't cout, their voice doesn't count.

Merely including <iostream> results in std::cout/std::cerr/std::cin being constructed on startup even if they're never used (as in this case).

In addition to the rightward arrow, there's the leftward arrow: int x = 3; while(n <-- x) { cout << x << endl; } which is different because it doesn't include the lower bound `n`.

$ cat unsigned.cpp #include <iostream> void f(unsigned int x) { std::cout << "x = " << x << std::endl; } int main() { f(-1); } $ g++ -Wall -Wextra -Wconversion -Werror unsigned.cpp $./a.out x = 4294967295 No error, no warning.

For example, how many copy constructors get called in this code: const std::string myString{"omg"}; std::cout << myString << (myString + myString); Most people will have to think about it for a little bit, and a lot of them will answer wrong.

$ cat unsigned.cpp #include <iostream> void f(unsigned int x) { std::cout << "x = " << x << std::endl; } int main() { f(-1); } $ g++ -Wall -Wextra -Wconversion -Werror unsigned.cpp $./a.out x = 4294967295 No error, no warning.

For example, how many copy constructors get called in this code: const std::string myString{"omg"}; std::cout << myString << (myString + myString); Most people will have to think about it for a little bit, and a lot of them will answer wrong.