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long long - target type will have width of at least 64 bits.
unsigned long long is the same as unsigned long long int . Its size is platform-dependent, but guaranteed by the C standard (ISO C99) to be at least 64 bits.
The C++ standard references the C standard for this, see [c.limits]. LLONG_MAX is defined in <climits> with the same meaning as C's <limits.h>'s LLONG_MAX. And this is what C has to say:
5.2.4.2.1 Sizes of integer types
<limits.h>The values given below shall be replaced by constant expressions suitable for use in
#ifpreprocessing directives. [...] Their implementation-defined values shall be equal or greater in magnitude (absolute value) to those shown, with the same sign.[...]
-- maximum value for an object of type
long long int
LLONG_MAX +9223372036854775807 //263 -1
A signed type that must be capable of representing the value 9223372036854775807 requires 64 bits or more.
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