Compilare: user.c: In function ‘main’: user.c:107:18: warning: variable ‘m’ set but not used [-Wunused-but-set-variable] int a, b, n, m, f1, f2, l, i; ^ user.c:107:15: warning: variable ‘n’ set but not used [-Wunused-but-set-variable] int a, b, n, m, f1, f2, l, i; ^ user.c:110:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &a, &b ); ^