Compilare: user.cpp: In function ‘void adauga(char*, nod*)’: user.cpp:19:17: warning: NULL used in arithmetic [-Wpointer-arith] if (cuv[0]==NULL) { p->nr++; return;} ///am ajuns la finalul cuvantului ^ user.cpp: In function ‘void sterge(char*, nod*)’: user.cpp:35:16: warning: NULL used in arithmetic [-Wpointer-arith] if(cuv[0]==NULL) ^ user.cpp: In function ‘int nr_aparitii(char*, nod*)’: user.cpp:54:17: warning: NULL used in arithmetic [-Wpointer-arith] if( cuv[0]==NULL) ^ user.cpp: In function ‘int prefix_max(char*, nod*)’: user.cpp:66:17: warning: NULL used in arithmetic [-Wpointer-arith] if(cuv[0]==NULL) ^