Compilare: user.cpp: In function ‘void add_word(node*, char*, int)’: user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void delete_word(node*, char*, int)’: user.cpp:42: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int count_words(node*, char*, int)’: user.cpp:61: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int prefix(node*, char*, int)’: user.cpp:74: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:94: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result