Compilare: user.c: In function ‘main’: user.c:5:15: warning: unused variable ‘a’ [-Wunused-variable] char v[2048],a; ^ user.c:11:9: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread (v,sizeof(char),2048,f); ^ user.c:23:7: warning: ‘ok’ may be used uninitialized in this function [-Wmaybe-uninitialized] ok++; ^