Compilare: user.c: In function ‘main’: user.c:12:7: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(&c, 1, 2097152, f); ^ user.c:35:6: warning: ‘nr2’ may be used uninitialized in this function [-Wmaybe-uninitialized] nr2++; if(nr2 > nr) ^ user.c:18:6: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] nr++; ^