C++ Programming - 13th Study
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C 프로그래밍을 안다는 기준으로 작성한 C++ 프로그래밍 자료입니다. 처음 배우는 사람들을 기준으로 작성한 자료도 차후에 올릴 예정입니다.
![10
void readFile(const string& fileName,
vector<int>& dest)
{
ifstream istr;
int temp;
istr.open(fileName.c_str());
// 값을 하나씩 읽어서 vector에 저장
while (istr >> temp)
dest.push_back(temp);
}
int main()
{
vector<int> myInts;
const string fileName = "numbers.txt";
readFile(fileName, myInts);
for (size_t i = 0; i < myInts.size(); i++)
cout << myInts[i] << " ";
cout << endl;
}](https://image.slidesharecdn.com/cprogramming-13thstudy-150713154541-lva1-app6891/85/C-Programming-13th-Study-10-320.jpg)
![11
void readFile(const string& fileName,
vector<int>& dest)
{
ifstream istr;
int temp;
istr.open(fileName.c_str());
if (istr.fail())
throw exception();
// 값을 하나씩 읽어서 vector에 저장
while (istr >> temp)
dest.push_back(temp);
}
int main()
{
vector<int> myInts;
const string fileName = "numbers.txt";
try {
readFile(fileName, myInts);
} catch (const exception& e) {
cerr << "Unable to open file "
<< fileName << endl;
return 1;
}
for (size_t i = 0; i < myInts.size(); i++)
cout << myInts[i] << " ";
cout << endl;
}](https://image.slidesharecdn.com/cprogramming-13thstudy-150713154541-lva1-app6891/85/C-Programming-13th-Study-11-320.jpg)
C++ Programming - 13th Study
- 3. 3
- 6. 6 try { // 익셉션이 발생할 코드 } catch (exception-type1 exception-name) { // type1 익셉션을 받아서 처리할 코드 } catch (exception-type2 exception-name) { // type2 익셉션을 받아서 처리할 코드 } // 나머지 코드
- 7. 7
- 8. 8 int Divide(int num, int den) { return num / den; } int main() { cout << Divide(5, 2) << endl; cout << Divide(10, 0) << endl; cout << Divide(3, 3) << endl; }
- 9. int Divide(int num, int den) { if (den == 0) throw invalid_argument("Divide by zero"); return num / den; } int main() { try { cout << Divide(5, 2) << endl; cout << Divide(10, 0) << endl; cout << Divide(3, 3) << endl; } catch (const invalid_argument& e) { cout << "Caught exception: " << e.what() << endl; } } 9
- 10. 10 void readFile(const string& fileName, vector<int>& dest) { ifstream istr; int temp; istr.open(fileName.c_str()); // 값을 하나씩 읽어서 vector에 저장 while (istr >> temp) dest.push_back(temp); } int main() { vector<int> myInts; const string fileName = "numbers.txt"; readFile(fileName, myInts); for (size_t i = 0; i < myInts.size(); i++) cout << myInts[i] << " "; cout << endl; }
- 11. 11 void readFile(const string& fileName, vector<int>& dest) { ifstream istr; int temp; istr.open(fileName.c_str()); if (istr.fail()) throw exception(); // 값을 하나씩 읽어서 vector에 저장 while (istr >> temp) dest.push_back(temp); } int main() { vector<int> myInts; const string fileName = "numbers.txt"; try { readFile(fileName, myInts); } catch (const exception& e) { cerr << "Unable to open file " << fileName << endl; return 1; } for (size_t i = 0; i < myInts.size(); i++) cout << myInts[i] << " "; cout << endl; }
- 12. 12 int Divide(int num, int den) { if (den == 0) throw "Divide by zero"; return num / den; } int main() { try { cout << Divide(5, 2) << endl; cout << Divide(10, 0) << endl; cout << Divide(3, 3) << endl; } catch (const string& s) { cout << s.c_str() << endl; } } 익셉션으로 던질 데이터의 타입이 변경되면 catch 구문도 수정해야 함
- 13. 13 void readFile(const string& fileName, vector<int>& dest) { ifstream istr; int temp; istr.open(fileName.c_str()); if (istr.fail()) // 파일 열기 실패에 따른 익셉션 throw invalid_argument(""); // 값을 하나씩 읽어서 vector에 저장 while (istr >> temp) dest.push_back(temp); if (istr.eof()) istr.close(); else { // 알 수 없는 오류에 의한 익셉션 istr.close(); throw runtime_error(""); } } try { readFile(fileName, myInts); } catch (const invalid_argument& e) { cerr << "Unable to open file " << fileName << endl; return 1; } catch (const runtime_error& e) { cerr << "Error reading file " << fileName << endl; return 1; }
- 14. 14 void readFile(const string& fileName, vector<int>& dest) throw (invalid_argument, runtime_error) { … } void readFile(const string& fileName, vector<int>& dest) throw (invalid_argument, runtime_error); void readFile(const string& fileName, vector<int>& dest) throw(); // C++98 void readFile(const string& fileName, vector<int>& dest) noexcept; // C++11
- 16. 16
- 17. bad_alloc bad_cast bad_typeid bad_exception logic_error out_of_range, invalid_argument, length_error runtime_error range_error, overflow_error, underflow_error 17
- 19. 19
- 20. 20 void f1() { throw 0; } void f2() { f1(); } void f3() { f2(); } void f4() { f3(); } int main() { try { f4(); } catch (int e) { cout << e << endl; } } 함수 호출 스택 풀기
- 21. 21 void funcOne() throw(exception) { string str1; string* str2 = new string(); funcTwo(); delete str2; } void funcTwo() throw(exception) { ifstream istr; istr.open("fileName"); throw exception(); istr.close(); } int main() { try { funcOne(); } catch (const exception& e) { cerr << "Exception caught!" << endl; return 1; } } 예외 발생 실행 X → 지역 변수는 소멸자 실행 실행 X → 포인터 변수는 메모리 릭 발생
- 22. http://en.cppreference.com/w/cpp/memory/shared_ptr http://en.cppreference.com/w/cpp/memory/unique_ptr 22 #include <memory> void funcOne() throw(exception) { string str1; // string* str2 = new string(); unique_ptr<string> str2(new string("Hello")); funcTwo(); // delete str2; }
- 23. 23 void funcOne() throw(exception) { string str1; string* str2 = new string(); try { funcTwo(); } catch (...) { delete str2; throw; // 익셉션 재전송 } delete str2; } “...”은 모든 타입의 익셉션을 매칭할 수 있음