Which initializer is appropriate for an int64_t?

Question

I like to initialize my variables to some \"dummy\" value and have started to use int64_t and uint64_t. So far, it looks like there are at least th

Answer 1

According to the ANSI C standard, the suffix for a long long int and unsigned long long int is LL and ULL respectively:

octal or hexadecimal suffixed by ll or LL long long int, unsigned long long int decimal, octal, or hexadecimal suffixed by both u or U, and ll or LL unsigned long long int

If you know that int64_t is defined as:

typedef signed long long int int64_t

Then method two is most definitely the correct one:

int64_t method_two   = 0LL;
uint64_t method_two   = 0ULL;

Edit:

Keeping in mind the portability issues, and the fact that it's not guaranteed to be defined as long long, then it would be better to use the third method:

INT64_C()
UINT64_C()