Integer literal with single quotes? [duplicate]

Answer 1

Since C++14,

from https://en.cppreference.com/w/cpp/language/integer_literal

Optional single quotes(') may be inserted between the digits as a separator. They are ignored by the compiler.

Answer 2

C++ allows single quotes to separate the digits for better reading:

https://en.cppreference.com/w/cpp/language/integer_literal

Optional single quotes(') may be inserted between the digits as a separator. They are ignored by the compiler.