Compilare: user.cpp: In function ‘int main()’: user.cpp:42:15: warning: unused variable ‘max’ [-Wunused-variable] long long max=0; ^ user.cpp:43:9: warning: unused variable ‘gr1’ [-Wunused-variable] int gr1=0; ^ user.cpp: In function ‘char nextch()’: user.cpp:12:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fi); ^