Compilare: user.c: In function ‘main’: user.c:48: warning: format ‘%ld’ expects type ‘long int *’, but argument 3 has type ‘long int’ user.c:46: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:48: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:48: warning: ‘nr’ may be used uninitialized in this function