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  1. #include <stdio.h>
  2.  
  3. union Float64 {
  4. 	double y;
  5. 	char bytes[8];
  6. };
  7.  
  8. int main(void) {
  9. 	const char digits[] = "0123456789abcdef";
  10. 	union Float64 q;
  11.  
  12. 	printf("Test Cases");
  13.  
  14. 	q.y = +1.0;
  15. 	printf("\n+1.0: ");
  16. 	for (int i = 7; i >= 0; i--) {
  17. 		char a = digits[q.bytes[i] & 0x0f];         // lower nibble
  18. 		char b = digits[(q.bytes[i] & 0xf0) >> 4];  // upper nibble
  19. 		printf("%c%c%c", b, a, i != 0 ? ' ' : '\0');
  20. 	}
  21.  
  22. 	q.y = +1.1;
  23. 	printf("\n+1.1: ");
  24. 	for (int i = 7; i >= 0; i--) {
  25. 		char a = digits[q.bytes[i] & 0x0f];         // lower nibble
  26. 		char b = digits[(q.bytes[i] & 0xf0) >> 4];  // upper nibble
  27. 		printf("%c%c%c", b, a, i != 0 ? ' ' : '\0');
  28. 	}
  29.  
  30.  	return 0;
  31. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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Standard input is empty
stdout
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Test Cases
+1.0: 3f f0 00 00 00 00 00 00
+1.1: 3f f1 99 99 99 99 99 9a
https://ideone.com/YLHccN
Double-precision +1.0, +1.1
language:
C (gcc 8.3)
created:
22 hours ago
visibility:
public

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