Eroare de compilare: user.cpp: In function ‘void insert(long int)’: user.cpp:17: error: ‘lookup’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:61: warning: format ‘%d’ expects type ‘int*’, but argument 4 has type ‘long int*’ user.cpp:58: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:61: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result