Compilare: main.cpp: In function 'int main()': main.cpp:86:53: warning: 'col2' may be used uninitialized in this function [-Wmaybe-uninitialized] g << lin1 << " " << col1 << " " << lin2 << " " << col2 << endl; ^~~~ main.cpp:86:31: warning: 'col1' may be used uninitialized in this function [-Wmaybe-uninitialized] g << lin1 << " " << col1 << " " << lin2 << " " << col2 << endl; ^~~ main.cpp:86:46: warning: 'lin2' may be used uninitialized in this function [-Wmaybe-uninitialized] g << lin1 << " " << col1 << " " << lin2 << " " << col2 << endl; ^~~ main.cpp:86:16: warning: 'lin1' may be used uninitialized in this function [-Wmaybe-uninitialized] g << lin1 << " " << col1 << " " << lin2 << " " << col2 << endl; ^~~