Compilare: user.cpp: In function ‘int main()’: user.cpp:78:18: warning: unused variable ‘k’ [-Wunused-variable] int q, i, j, k, l, x1, x2, y1, y2; ^ user.cpp:78:21: warning: unused variable ‘l’ [-Wunused-variable] int q, i, j, k, l, x1, x2, y1, y2; ^ user.cpp: In function ‘int getInt()’: user.cpp:22:37: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, maxb, 1, fin); ^ user.cpp:31:37: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, maxb, 1, fin); ^ user.cpp: In function ‘char getChar()’: user.cpp:43:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, maxb, 1, fin), ptr=0; ^ user.cpp:46:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, maxb, 1, fin), ptr=0; ^