Compilare: user.c: In function ‘main’: user.c:8: warning: format ‘%ld’ expects type ‘long int *’, but argument 3 has type ‘int *’ user.c:8: warning: format ‘%ld’ expects type ‘long int *’, but argument 4 has type ‘int *’ user.c:9: warning: format ‘%ld’ expects type ‘long int’, but argument 3 has type ‘int’ user.c:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result