Compilare: user.c: In function ‘main’: user.c:12:1: warning: format ‘%d’ expects argument of type ‘int *’, but argument 3 has type ‘long unsigned int *’ [-Wformat=] fscanf(r,"%d",&n); ^ user.c:17:5: warning: format ‘%d’ expects argument of type ‘int *’, but argument 3 has type ‘long unsigned int *’ [-Wformat=] {fscanf(r,"%d",&x); ^ user.c:28:1: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long unsigned int’ [-Wformat=] fprintf(w,"%d",nr); ^ user.c:12:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(r,"%d",&n); ^ user.c:14:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(r,"%d",&x0); ^ user.c:17:12: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] {fscanf(r,"%d",&x); ^