写出下列程序运行结果 #include “stdio.h” void swap(int *px , int *py ); void main() { int a,b; a=5; b=10; printf(“ before swap a=%d, b=%d\n”,a,b); swap(&a,&b); printf(“after swap a=%d, b=%d\n”,a,b); } voidswap(int *px , int *py ) { int temp; temp=*px; *px=* py; *py=temp; printf(“ in swap x=%d,y=%d\n”,*px, *py); }