Compilare: user.cpp: In function ‘int main()’: user.cpp:177:9: warning: variable ‘q’ set but not used [-Wunused-but-set-variable] int q, i, x, y, n; ^ user.cpp:177:15: warning: unused variable ‘x’ [-Wunused-variable] int q, i, x, y, n; ^ user.cpp:177:18: warning: unused variable ‘y’ [-Wunused-variable] int q, i, x, y, n; ^ user.cpp: In function ‘char nextch()’: user.cpp:17:37: 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); ^