Compilare: user.cpp: In function ‘char nextch()’: user.cpp:14:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, BUF_SIZE, 1, fi); ^ user.cpp: In function ‘int main()’: user.cpp:71:13: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] int x; ^