Compilare: user.cpp: In function ‘int main()’: user.cpp:82:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:83:9: warning: unused variable ‘x’ [-Wunused-variable] int x, y; ^ user.cpp:83:12: warning: unused variable ‘y’ [-Wunused-variable] int x, y; ^ user.cpp: In function ‘char getChar(FILE*)’: user.cpp:18:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, BUF_SIZE, f); ^