Compilare: user.cpp: In function ‘void insert(char*)’: user.cpp:29: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp: In function ‘int number(char*)’: user.cpp:40: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp: In function ‘int prefix(char*)’: user.cpp:53: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp: In function ‘int main()’: user.cpp:73: warning: format ‘%d’ expects type ‘int*’, but argument 2 has type ‘char*’ user.cpp:71: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:72: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result