Compilare: user.cpp: In function ‘void constr_vect_temp()’: user.cpp:13:23: warning: NULL used in arithmetic [-Wpointer-arith] for(int i=2;z[i]!=NULL;i++) ^ user.cpp: In function ‘void cauta()’: user.cpp:26:24: warning: NULL used in arithmetic [-Wpointer-arith] for(int i=1;s[i]!=NULL;i++) ^ user.cpp: In function ‘int main()’: user.cpp:54:8: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] s[n+1]=NULL; ^ user.cpp:55:9: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] z[n+1]=NULL; ^