Compilare: main.cpp: In function 'int main()': main.cpp:124:37: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread (buff , 1 , 5000000 , fin); ^ main.cpp:200:13: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf (fout,"%d %d %d %d", x - dx , y - dy , x , y); ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~