Numeric literals of more than a few digits are hard to read.
C++14 define Simple Quotation Mark
' as a digit separator, in numbers and user-defined literals. This can make it easier for human readers to parse large numbers.
long long decn = 1'000'000'000ll; long long hexn = 0xFFFF'FFFFll; long long octn = 00'23'00ll; long long binn = 0b1010'0011ll;
Single quotes mark are ignored when determining its value.
0'004'000'000all have the same value.
1.602176565e-19have the same value.
The position of the single quotes is irrelevant. All the following are equivalent:
long long a1 = 123456789ll; long long a2 = 123'456'789ll; long long a3 = 12'34'56'78'9ll; long long a4 = 12345'6789ll;
It is also allowed in
std::chrono::seconds tiempo = 1'674'456s + 5'300h;