Fix format warning #18
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Use macro constant PRIx64 instead of "llx" to fix the following warning.
```
pcg32x2-demo.c: In function 'main':
pcg32x2-demo.c:156:30: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 2 has type 'uint64_t' {aka 'long unsigned int'} [-Wformat=]
156 | printf(" 0x%016llx", pcg32x2_random_r(&rng));
| ~~~~~~^ ~~~~~~~~~~~~~~~~~~~~~~
| | |
| | uint64_t {aka long unsigned int}
| long long unsigned int
| %016lx
```
Fixed width integer types were added in C99.
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Use macro constant
PRIx64instead ofllxto fix the following warning.Change "C89" to "C99" because fixed width integer types were added in C99.
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#includedirectives inpcg32x2-demo.c.Add newline at end of
.gitignore.