标签：能正确实现此功能的函数是Avoidfuna(intx，inty){x=x+y;y=xy;x=xy;}Bvoidfuna(intx，inty){intp;p=x;x=y;y=p;}Cvoidfuna(intx，inty){intt;t=x;x=y;y=t;}Dintfuna(intx，inty){x=y;y=x;}