integer literal

 

C++

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Syntax

[0-9]+ type_suffix	(1)
0 [0-7]+ type_suffix	(2)
0 x [0-9a-b]+ type_suffix	(3)

Explanation

1. Decimal notation
2. Octal notation
3. Hexadecimal notation

Types by suffix

(no suffix)

int

u

unsigned int

l

long

ul

unsigned long

ll (since C++11)

long long

ull (since C++11)

unsigned long long

Notes

• Letters in integer constants are case-insensitive.

Example

std::cout << 123    << '\n'
          << 0123   << '\n'
          << 0x123  << '\n'
          << 12345678901234567890UL << '\n'
          << -1u    << '\n'
          << -1ull  << '\n';

Output:

123
83
291
12345678901234567890
4294967295
18446744073709551615

(output from an x86_64 processor)