Compilare: user.c: In function ‘main’: user.c:22: warning: format ‘%i’ expects type ‘int *’, but argument 3 has type ‘long unsigned int *’ user.c:39: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘double’ user.c:17: warning: unused variable ‘j’ user.c:22: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result