Compilare: user.c: In function ‘main’: user.c:30: warning: format ‘%ld’ expects type ‘long int’, but argument 3 has type ‘long long int’ user.c:18: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:23: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result