Compilare: main.cpp: In function 'int main()': main.cpp:21:8: warning: this 'else' clause does not guard... [-Wmisleading-indentation] else ^~~~ main.cpp:23:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else' f.close(); ^ main.cpp:20:12: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized] g<<r; ^