填空题：以下程序运行后的输出结果是()‏‍#include‏‍voidfunc()‏‍{‏‍externintx，y;‏‍inta=，b=;‏‍x=ab;‏‍y=a+b;‏‍}‏‍intx，y;‏‍intmain()‏‍{‏‍inta=，b=;‏‍intx;‏‍x=a+b;‏‍y=ab;‏‍func();‏‍printf(“%d，%d”，x，y);‏‍return;‏‍}‏