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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 = +1.5;
  15. 	printf("\n+1.5:     ");
  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 = +1.25;
  23. 	printf("\n+1.25:    ");
  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. 	q.y = +1.125;
  31. 	printf("\n+1.125:   ");
  32. 	for (int i = 7; i >= 0; i--) {
  33. 		char a = digits[q.bytes[i] & 0x0f];         // lower nibble
  34. 		char b = digits[(q.bytes[i] & 0xf0) >> 4];  // upper nibble
  35. 		printf("%c%c%c", b, a, i != 0 ? ' ' : '\0');
  36. 	}
  37.  
  38. 	q.y = +1.0625;
  39. 	printf("\n+1.0625:  ");
  40. 	for (int i = 7; i >= 0; i--) {
  41. 		char a = digits[q.bytes[i] & 0x0f];         // lower nibble
  42. 		char b = digits[(q.bytes[i] & 0xf0) >> 4];  // upper nibble
  43. 		printf("%c%c%c", b, a, i != 0 ? ' ' : '\0');
  44. 	}
  45.  
  46. 	q.y = +1.03125;
  47. 	printf("\n+1.03125: ");
  48. 	for (int i = 7; i >= 0; i--) {
  49. 		char a = digits[q.bytes[i] & 0x0f];         // lower nibble
  50. 		char b = digits[(q.bytes[i] & 0xf0) >> 4];  // upper nibble
  51. 		printf("%c%c%c", b, a, i != 0 ? ' ' : '\0');
  52. 	}
  53.  
  54.  	return 0;
  55. }
Success #stdin #stdout 0.01s 5324KB
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stdin
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Standard input is empty
stdout
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Test Cases
+1.5:     3f f8 00 00 00 00 00 00
+1.25:    3f f4 00 00 00 00 00 00
+1.125:   3f f2 00 00 00 00 00 00
+1.0625:  3f f1 00 00 00 00 00 00
+1.03125: 3f f0 80 00 00 00 00 00
https://ideone.com/dnCb4M
Double-precision fractions with ending 5
language:
C (gcc 8.3)
created:
22 hours ago
visibility:
public

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