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  1. #include <iostream>
  2. #include <cctype>
  3.  
  4. enum state {
  5. 	s_zero, s_number, s_end
  6. };
  7.  
  8. state m_next(const char*& s, size_t& n){
  9. 	state st;
  10.  
  11. 	if(! *s)
  12. 		st = s_end;
  13. 	else {
  14. 		while(*s && ! std::isdigit(*s))
  15. 			++s;
  16.  
  17. 		if(*s == '0'){
  18. 			++s;
  19. 			st = s_zero;
  20. 		} else {
  21. 			for(n = 0; std::isdigit(*s); ++s)
  22. 				n = n*10 + (size_t)(*s - '0');
  23. 			st = s_number;
  24. 		}
  25. 	}
  26. 	return st;
  27. }
  28.  
  29.  
  30. int main(void){
  31. 	char  s[] = "1 2 4 0 4 4 5 0 32 21 35 0 3 0";
  32.  
  33. 	state  st;
  34. 	size_t n;
  35.  
  36. 	size_t sum = 0;
  37. 	const char* ptr = &s[0];
  38. 	do {
  39.  
  40. 		switch((st = m_next(ptr, n))){
  41. 		case s_number:
  42. 			sum += n;
  43. 			break;
  44. 		case s_zero:
  45. 			std::cout << "sum: " << sum << std::endl;
  46. 			sum = 0;
  47. 			break;
  48. 		}
  49.  
  50. 	} while(st != s_end);
  51. 	return 0;
  52. }
Success #stdin #stdout 0s 3096KB
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stdin
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Standard input is empty
stdout
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sum: 7
sum: 13
sum: 88
sum: 3
https://ideone.com/vRUQlX
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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