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  1. #include <iostream>
  2. #include <limits>
  3. #include <sstream>
  4. #include <string>
  5. #include <vector>
  6.  
  7. using namespace std;
  8.  
  9. struct Type {
  10. 	string line;
  11. 	int index;
  12. };
  13.  
  14. int main() {
  15. 	istringstream f("key = -2\nkey = -1\nkey = 0\nÄèîpg\nkey = 2");
  16. 	string line;
  17. 	int lineNumber = 0;
  18. 	const auto line1 = 20;
  19. 	const auto line2 = 6;
  20. 	size_t pos;
  21. 	vector<Type> linesVector;
  22.  
  23. 	if (f.good()){
  24. 	    while (getline(f, line)) {
  25. 	        lineNumber++;
  26. 	        if ((lineNumber>= line1 - 20) && (lineNumber<= line2)){
  27. 	            pos = line.find("key = 0");
  28. 	            if (pos != string::npos){
  29. 					if(!f.ignore(numeric_limits<std::streamsize>::max(), '\n')) {
  30. 					    break;
  31. 					}
  32. 				    ++lineNumber;
  33. 	                std::cout << "skip the line" << endl;
  34. 	            }
  35. 	            else{
  36. 	                Type v;
  37. 	                v.line= line;
  38. 	                v.index = lineNumber;
  39. 	                linesVector.push_back(v);
  40. 	            }
  41. 	        }
  42. 	    }
  43. 	}
  44.  
  45. 	for(const auto& i : linesVector) cout << i.index << ": " << i.line << endl;
  46.  }
Success #stdin #stdout 0s 15240KB
comments (?)
stdin
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Standard input is empty
stdout
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skip the line
1: key = -2
2: key = -1
5: key = 2
https://ideone.com/6YEnu4
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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