Compilare: main.cpp: In function 'int main()': main.cpp:17:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sir.size() ; i += 8) ~~^~~~~~~~~~~~~ main.cpp:20:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i + 7 >= sir.size()) ~~~~~~^~~~~~~~~~~~~ main.cpp:27:18: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] cuv[9] = NULL; ^~~~ main.cpp:48:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < wrong.size(); ++i) ~~^~~~~~~~~~~~~~