Compilare: user.c: In function ‘main’: user.c:12:16: warning: return makes integer from pointer without a cast [-Wint-conversion] return NULL; ^ user.c:15:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&lung); ^ user.c:17:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d", &arr[i]); ^