单选题 有下列程序 # include <stdio.h> void fun1(int *x,int *y) { int *z; z=x; x=y; y=z; } void fun2(int *x,int *y) { int z; z=*x; *x=*y; *y=z; (*x)++; (*y)++; } void main() { int a=5,b=9; fun1(&a,&b); printf("a=%d,b=%d\n",a,b); fun2(&a,&b); printf("a=%d,b=%d\n",a,b); } main函数中第二个printf输出结果为( )