Compilare: main.cpp: In function 'void anagrama()': main.cpp:26:14: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] aux[1] = NULL; ^~~~ main.cpp:29:14: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] aux[1] = NULL; ^~~~ main.cpp:35:15: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] aux[1] = NULL; ^~~~ main.cpp:43:14: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] aux[1] = NULL; ^~~~ main.cpp: In function 'int main()': main.cpp:53:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i <= strlen(sir); i++) ~~^~~~~~~~~~~~~~