Compilare: main.cpp: In function 'int main()': main.cpp:36:24: warning: NULL used in arithmetic [-Wpointer-arith] while (s[i] != NULL) ^~~~ main.cpp:41:27: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] cuv[vf] = NULL; ^~~~ main.cpp:48:29: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] cuv[++vf] = NULL; ^~~~ main.cpp:56:9: warning: unused variable 'ok' [-Wunused-variable] int ok = 0; ^~ main.cpp:41:23: warning: array subscript is below array bounds [-Warray-bounds] cuv[vf] = NULL; ~~~~~~^