Compilare: user.cpp: In function ‘int main()’: user.cpp:38:18: warning: unused variable ‘j’ [-Wunused-variable] int n, i, l, j; ^ user.cpp:43:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d ", &n); ^ user.cpp: In function ‘char nextch()’: user.cpp:15:37: 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, fin); ^