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Question #24 Difficulty: 1

According to the C++17 standard, what is the output of this program? 

    #include <iostream>
#include <limits>

int main() {
  unsigned int i = std::numeric_limits<unsigned int>::max();
  std::cout << ++i;
}

Correct!

Unsigned integers have well defined behaviour when they overflow. When you go one above the largest representable unsigned int, you end up back at zero.

According to §[basic.fundamental]¶4 in the C++ standard: "Unsigned integers, declared unsigned, shall obey the laws of arithmetic modulo 2^n where n is the number of bits in the value representation of that particular size of integer."

You can explore this question further on C++ Insights or Compiler Explorer!

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