Compilare: user.c: In function ‘main’: user.c:12:2: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &t); ^~~~~~~~~~~~~~~~~~~~ user.c:14:3: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^~~~~~~~~~~~~~~~~~~~ user.c:16:4: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &x); ^~~~~~~~~~~~~~~~~~~~ user.c:20:5: warning: ‘s’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(s != 0) ^