Compilare: user.cpp: In function ‘int main()’: user.cpp:157:9: warning: unused variable ‘st’ [-Wunused-variable] int st = s[0].val; ^ user.cpp: In function ‘char nextch()’: user.cpp:28:30: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(b, 1, MAX, fin); ^