Compilare: user.c: In function ‘main’: user.c:55:9: warning: operation on ‘ok’ may be undefined [-Wsequence-point] ok = ok = blk_read(line1, f); ^ user.c:11:40: warning: variable ‘line2’ set but not used [-Wunused-but-set-variable] char *line1, *c, a[100], b[100], *p, *line2; ^ user.c: In function ‘blk_read’: user.c:108:7: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(line + HLF, 1, HLF, f); ^ user.c:109:1: warning: control reaches end of non-void function [-Wreturn-type] } ^