Compilare: user.c: In function ‘main’: user.c:42:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.c:44:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &v[i]); ^ user.c: In function ‘calc’: user.c:11:25: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] int nr = 0, a = v[x], last, aux; ^