Code:#include <iostream> #include <fstream> #include <list> using namespace std; int main() { int no_of_vertices; ifstream fin; fin.open("RECTANGLE_GRAPH.txt",ios::in); if( !fin ) { cout << "File not found!" << endl; return 1; } fin >> no_of_vertices; return 0; }Using CODE BLOCKS 10.05 in UBUNTU 10.10. Any help please?Code:/usr/include/c++/4.4/fstream||In constructor ‘std::basic_ifstream<_CharT, _Traits>::basic_ifstream() [with _CharT = char, _Traits = std::char_traits<char>]’:| /usr/include/c++/4.4/fstream|440|warning: will never be executed| /usr/include/c++/4.4/fstream|440|warning: will never be executed| /usr/include/c++/4.4/fstream|440|warning: will never be executed| /usr/include/c++/4.4/fstream|440|warning: will never be executed| /usr/include/c++/4.4/fstream|441|warning: will never be executed| /usr/include/c++/4.4/fstream|441|warning: will never be executed| /usr/include/c++/4.4/bits/basic_ios.h||In constructor ‘std::basic_ios<_CharT, _Traits>::basic_ios() [with _CharT = char, _Traits = std::char_traits<char>]’:| /usr/include/c++/4.4/bits/basic_ios.h|453|warning: will never be executed| /usr/include/c++/4.4/istream||In constructor ‘std::basic_istream<_CharT, _Traits>::basic_istream() [with _CharT = char, _Traits = std::char_traits<char>]’:| /usr/include/c++/4.4/istream|582|warning: will never be executed| /usr/include/c++/4.4/istream|582|warning: will never be executed| /usr/include/c++/4.4/istream|582|warning: will never be executed| /usr/include/c++/4.4/istream|582|warning: will never be executed| /usr/include/c++/4.4/istream|583|warning: will never be executed| /usr/include/c++/4.4/istream|583|warning: will never be executed| /usr/include/c++/4.4/istream||In destructor ‘std::basic_istream<_CharT, _Traits>::~basic_istream() [with _CharT = char, _Traits = std::char_traits<char>]’:| /usr/include/c++/4.4/istream|102|warning: will never be executed| /usr/include/c++/4.4/istream|102|warning: will never be executed| /usr/include/c++/4.4/istream|102|warning: will never be executed| /usr/include/c++/4.4/fstream||In destructor ‘std::basic_ifstream<_CharT, _Traits>::~basic_ifstream() [with _CharT = char, _Traits = std::char_traits<char>]’:| /usr/include/c++/4.4/fstream|486|warning: will never be executed| /usr/include/c++/4.4/fstream|486|warning: will never be executed| /usr/include/c++/4.4/fstream|486|warning: will never be executed| /usr/include/c++/4.4/fstream|486|warning: will never be executed| /usr/include/c++/4.4/fstream|486|warning: will never be executed| ||=== Build finished: 0 errors, 21 warnings ===|