Compilare: user.c: In function ‘calc_nr’: user.c:27:25: warning: unused variable ‘rang’ [-Wunused-variable] int k, l, r, count, rang; ^ user.c:27:18: warning: unused variable ‘count’ [-Wunused-variable] int k, l, r, count, rang; ^ user.c:27:15: warning: unused variable ‘r’ [-Wunused-variable] int k, l, r, count, rang; ^ user.c:27:12: warning: unused variable ‘l’ [-Wunused-variable] int k, l, r, count, rang; ^ user.c:27:9: warning: unused variable ‘k’ [-Wunused-variable] int k, l, r, count, rang; ^ user.c: In function ‘main’: user.c:77:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(s1, nmax-1, in); ^ user.c:78:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(s2, nmax-1, in); ^