Nicely formatting numbers in C++
c++
Solution
As of C++14, you can use `'` as a digit group separator:
auto one_m = 1'000'000;
Previous versions of C++ did not support this natively. There were two major workarounds:
Using user-defined literals in C++11; this would allow you to write code as follows:
auto x = "1_000_000"_i;
(Writing this as a `constexpr` would be trickier – but is definitely possible.)
Using a straightforward macro, which would allow the following code:
auto x = NUM(1,000,000);
Problem
In Ada it is possible to write numbers with underscores for separating digits, which greatly improves readability. For example: 1_000_000 (which is equivalent to 1000000) Is there some similar way for C++? EDIT: This is question about source code, not I/O.