integer literal

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Contents

1 Syntax
2 Explanation
3 Types by suffix
4 Notes
5 Example

[edit] Syntax


[0-9]+ type_suffix	(1)

0 [0-7]+ type_suffix	(2)

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

[edit] Explanation

Decimal notation
Octal notation
Hexadecimal notation

[edit] 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

[edit] Notes

In the hexadecimal notation (3) and type suffix letters are case insensitive

[edit] 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)

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