Compilare: user.c: In function ‘main’: user.c:29:18: warning: unused variable ‘j’ [-Wunused-variable] int i, n, k, T, j; ^ user.c:29:15: warning: unused variable ‘T’ [-Wunused-variable] int i, n, k, T, j; ^ user.c:29:12: warning: unused variable ‘k’ [-Wunused-variable] int i, n, k, T, j; ^ user.c:29:9: warning: unused variable ‘n’ [-Wunused-variable] int i, n, k, T, j; ^ user.c:29:6: warning: unused variable ‘i’ [-Wunused-variable] int i, n, k, T, j; ^ user.c:28:13: warning: unused variable ‘out’ [-Wunused-variable] FILE *in, *out; ^ user.c:28:8: warning: unused variable ‘in’ [-Wunused-variable] FILE *in, *out; ^