unsigned long long
¶
An unsigned version of the long long data type.
An unsigned long long
occupies 8 bytes of memory; it stores an
integer from 0 to 2^64-1, which is approximately 1.8×10^19 (18
quintillion, or 18 billion billion).
A synonym for the unsigned long long
type is uint64
.
Like an unsigned int, an unsigned long
long
won’t store negative numbers; it is also subject to the same
overflow issues as any integral data type.
Here is an example of declaring an unsigned long long
variable
named c
, then giving it value 299,792,458,000,000,000 (see
integer constants for an
explanation of the “ULL” at the end of the number):
// Speed of light in nanometers per second (approximate).
unsigned long long c = 299792458000000000ULL;
The general syntax for declaring an unsigned long long
variable named
var
, then giving it value val
, looks like:
unsigned long long var = val;
See Also¶
License and Attribution
Portions of this page were adapted from the Arduino Reference Documentation, which is released under a Creative Commons Attribution-ShareAlike 3.0 License.