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  1. #include <stdio.h>
  2. #include <stdbool.h>
  3.  
  4. bool toHex1(int val, char *dstPtr){
  5. 	if (dstPtr == NULL) {
  6. 		return false;
  7. 	}
  8. 	sprintf(dstPtr, "%X", val);
  9. 	return true;
  10. }
  11. bool toHex2(int val, char *dstPtr) {
  12. 	if (dstPtr == NULL) {
  13. 		return false;
  14. 	}
  15.  
  16. 	char wrkstr[5] = {0};
  17. 	static const int maxbit = 16;
  18. 	int wrkval = val;
  19. 	int bit = 0;
  20. 	while(bit <= maxbit) {
  21. 		wrkval = (val >> bit & 0xF);
  22. 		if (wrkval == 0) {
  23. 			break;
  24. 		}
  25. 		if (wrkval < 10) {
  26. 			wrkstr[bit/4] = '0' + wrkval;
  27. 		} else {
  28. 			wrkstr[bit/4] = 'A' + (wrkval - 10);
  29. 		}
  30. //		printf("%d", wrkval);
  31. 		bit += 4;
  32. 	}
  33.  
  34. 	int idx = bit / 4 - 1;
  35. 	while(idx >= 0) {
  36. 		dstPtr[idx] = wrkstr[bit / 4 - idx - 1];
  37. 		idx--;	
  38. 	}
  39.  
  40. 	return true;		
  41. }
  42.  
  43. int main(void) {
  44. 	int val=0;
  45. 	char res[20];
  46.  
  47. 	if(toHex1(val, res)) {
  48. 		printf("%d %s\n", val, res);
  49. 	}
  50. 	res[0] = 0x0;
  51. 	if(toHex2(val, res)) {
  52. 		printf("%d %s\n", val, res);
  53. 	}
  54.  
  55. 	return 0;
  56. }
  57.  
Success #stdin #stdout 0s 2168KB
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https://ideone.com/94tjai
C > from decima to hexadecimal
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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