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  1. #include <iostream>
  2. #include <cstring>
  3. using namespace std;
  4.  
  5. int parse(char digit) {
  6. 	int result;
  7. 	switch(digit) {
  8. 		case 'I': result = 1; break;
  9. 		case 'V': result = 5; break;
  10. 		case 'X': result = 10; break;
  11. 		case 'L': result = 50; break;
  12. 		case 'C': result = 100; break;
  13. 		case 'D': result = 500; break;
  14. 		case 'M': result = 1000; break;
  15. 		default: result = 0;
  16. 	}
  17. 	return result;
  18. }
  19.  
  20. int parse(char *number) {
  21. 	int result = 0, previous = parse(number[0]), current;
  22. 	for(int i = 1; (current = parse(number[i])) != 0; i++) {
  23. 		result += previous < current ? -previous : previous;
  24. 		previous = current;
  25. 	}
  26. 	result += previous;
  27. 	return result;
  28. }
  29.  
  30. void print(int number) {
  31. 	char result[1000]{'\0'};
  32. 	const int values[] = { 1, 4, 5, 9, 10, 40, 50, 90, 100, 400, 500, 900, 1000 };
  33. 	const char *symbols[] = { "I", "IV", "V", "IX", "X", "XL", "L", "XC", "C", "CD", "D", "CM", "M" };
  34. 	int counter = sizeof(symbols) / sizeof(symbols[0]) - 1; // array length
  35. 	while(counter >= 0) {
  36. 		while(number >= values[counter]) {
  37. 			number -= values[counter];
  38. 			strcat(result, symbols[counter]);
  39. 		}
  40. 		counter--;
  41. 	}
  42. 	cout << result << endl;
  43. }
  44.  
  45. int main() {
  46. 	char line[1000];
  47. 	cin >> line;
  48. 	char *a = strtok(line, "+");
  49. 	char *b = strtok(NULL, "");
  50. 	print(parse(a) + parse(b));
  51. 	return 0;
  52. }
Success #stdin #stdout 0s 3464KB
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https://ideone.com/DBHLDX
7
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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