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  1. #include <stdio.h>
  2. #include <limits.h>
  3.  
  4. #define INT_BITS (sizeof(int)*8)
  5.  
  6. typedef struct div_result div_result;
  7. struct div_result {
  8. 	int quotient;
  9. 	int remainder;
  10. };
  11.  
  12. div_result divide(int dividend, int divisor) {
  13. 	div_result result;
  14.  
  15. 	if (divisor == 0) {
  16. 		result.quotient = dividend < 0 ? INT_MIN : INT_MAX;
  17. 		result.remainder = 0;
  18. 		return result;
  19. 	}
  20.  
  21. 	if ((dividend == INT_MIN) && (divisor == -1)) {
  22. 		result.quotient = INT_MAX;
  23. 		result.remainder = 0;
  24. 		return result;
  25. 	}
  26.  
  27. 	int negative = (dividend < 0) ^ (divisor < 0);
  28.  
  29. 	if (dividend < 0) {
  30. 		dividend = -dividend;
  31. 	}
  32. 	if (divisor < 0) {
  33. 		divisor = -divisor;
  34. 	}
  35.  
  36. 	int quotient = 0, remainder = 0;
  37.  
  38. 	for (int i = 0; i < sizeof(int)*8; i++) {
  39. 		quotient <<= 1;
  40.  
  41. 		remainder <<= 1;
  42. 		remainder += (dividend >> (INT_BITS - 1)) & 1;
  43. 		dividend <<= 1;
  44.  
  45. 		if (remainder >= divisor) {
  46. 			remainder -= divisor;
  47. 			quotient++;
  48. 		}
  49. 	}
  50.  
  51. 	if (negative) {
  52. 		result.quotient = -quotient;
  53. 		result.remainder = -remainder;
  54. 	} else {
  55. 		result.quotient = quotient;
  56. 		result.remainder = remainder;
  57. 	}
  58. 	return result;
  59. }
  60.  
  61. int main() {
  62. 	int dividend, divisor;
  63. 	scanf("%i%i", &dividend, &divisor);
  64.  
  65. 	div_result result = divide(dividend, divisor);
  66. 	printf("%i %i\r\n", result.quotient, result.remainder);
  67. }
  68.  
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https://ideone.com/IiKDxM
language:
C99 (gcc 8.3)
created:
10 years ago
visibility:
public

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