C++ Brain Teasers

Puzzle 25

Weakly Typed, Strongly Puzzling

weakly-typed-strongly-puzzling.cpp

#include <iostream>

int main()
{
    std::cout << +!!"";
}

Guess the Output
	Try to guess what the output is before moving to the next page.

The program displays the following output:

1

Discussion

Wait, what? Is this legal C++? What does it even mean, and why does it print 1?

While C++ is a statically typed language, it’s not particularly strongly typed. As we’ve ...