Compilare: main.c: In function 'main': main.c:20:15: warning: format '%lu' expects argument of type 'long unsigned int *', but argument 3 has type 'unsigned int *' [-Wformat=] fscanf(f, "%lu", &n); ^ main.c:32:16: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'unsigned int' [-Wformat=] fprintf(f, "%lu \n", i-1); ^ main.c:20:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lu", &n); ^~~~~~~~~~~~~~~~~~~~