Any way to format large numbers in code for easier reading?

Question

I was looking a bit for a solution to this (or a previously asked question about SO), but all that appears is the results for formatting the numbers in the output of the program, which is not what I'm looking for. My question is whether there are any solutions for formatting a large number of IN code (and not the output program) to make them easier to read.

for instance

int main()
{
    int LargeNumber = 1000000;
}

This number contains 1 million, but it is not so easy to say right away without moving the cursor over it and without counting. Are there any good solutions for this other than a comment?

int main()
{
    int LargeNumber = 1000000;//1,000,000
}

Thank.

Answer 1

, :

int main()
{
    int LargeNumber = 1'000'000;
}

( ++ 14), , , . , . Offhand , , (, g++, clang V++).