ifstream::is_open - C++ Reference
http://www.cplusplus.com/reference/fstream/ifstream/is_open/
1 // ifstream::is_open 2 #include <iostream> // std::cout 3 #include <fstream> // std::ifstream 4 5 int main () { 6 std::ifstream ifs ("test.txt"); 7 8 if (ifs.is_open()) { 9 // print file: 10 char c = ifs.get(); 11 while (ifs.good()) { 12 std::cout << c; 13 c = ifs.get(); 14 } 15 } 16 else { 17 // show message: 18 std::cout << "Error opening file"; 19 } 20 21 return 0; 22 }