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  1. #include <stdio.h>
  2. #include <inttypes.h>
  3.  
  4. union wide_t {
  5. 	__int128 i;
  6. 	uint64_t a[2];
  7. };
  8.  
  9. int main(void) {
  10. 	union wide_t val;
  11.  
  12. 	val.i = -1;
  13. 	puts ((val.i & ((__int128) 1 << 127)) ? "negative" : "positive");
  14. 	printf("%016" PRIx64 "%016" PRIx64 "\n", val.a[1], val.a[0]);
  15.  
  16. 	// // -2^63 (it fits!)
  17. 	val.i = -9223372036854775808ull; 
  18. 	puts ((val.i & ((__int128) 1 << 127)) ? "negative" : "positive");
  19.  
  20. 	val.i = -9223372036854775808ll; 
  21. 	puts ((val.i & ((__int128) 1 << 127)) ? "negative" : "positive");
  22. 	return 0;
  23. }
  24.  
Success #stdin #stdout 0s 4368KB
comments (?)
stdin 
Standard input is empty
stdout 
negative
ffffffffffffffffffffffffffffffff
positive
negative
https://ideone.com/h3dlQ5
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

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