Compilare: user.c: In function ‘citire’: user.c:88:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ user.c: In function ‘bktr’: user.c:22:20: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i = 2; i< x/(unsigned long)2; i++){ ^ user.c:33:23: note: ‘x’ was declared here unsigned long x; ^