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  1. #include <cstdlib>
  2. #include <iostream>
  3. #include <iterator>
  4. #include <stdexcept>
  5. #include <string>
  6.  
  7. using namespace std;
  8.  
  9. int main() {
  10. 	const string foo[] = { "12", "1X", "X2" };
  11.  
  12. 	for (const auto& i : foo) {
  13. 		{
  14. 		    char* size;
  15. 		    const int num = strtol(i.c_str(), &size, 10);
  16.  
  17. 		    if(distance(i.c_str(), const_cast<const char*>(size)) == i.size()) {
  18. 		        cout << "strtol: " << num << endl;
  19. 		    } else {
  20. 		        cout << "strtol: error\n";
  21. 		    }
  22. 		}
  23. 		{
  24. 		    size_t size;
  25. 		    int num;
  26.  
  27. 		    if(sscanf(i.c_str(), "%d%zn", &num, &size) == 1 && size == i.size()) {
  28. 		        cout << "sscanf: " << num << endl;
  29. 		    } else {
  30. 		        cout << "sscanf: error\n";
  31. 		    }			
  32. 		}
  33.  
  34. 		{    
  35. 			try {
  36. 		        size_t size;
  37. 		        const auto num = stoi(i, &size);
  38.  
  39. 		        if(size == i.size()) {
  40. 		            cout << "stoi: " << num << endl;
  41. 		        } else {
  42. 		            throw invalid_argument("invalid stoi argument");
  43. 		        }
  44. 	    	} catch(const invalid_argument& /*e*/) {
  45. 	        	cout << "stoi: error\n";
  46. 	    	}
  47.     	}
  48. 	}
  49. 	return 0;
  50. }
Success #stdin #stdout 0s 15240KB
comments (?)
stdin
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Standard input is empty
stdout
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strtol: 12
sscanf: 12
stoi: 12
strtol: error
sscanf: error
stoi: error
strtol: error
sscanf: error
stoi: error
https://ideone.com/LO2Qnq
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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