下列程序中需要清理动态分配的数组，划线处应有的语句是 【13】 。#include＜iostream, h＞class person{ int age, tall;public: person() { age= 0; tall= 40; cout＜＜"A baby is born. "＜＜end1;} person(int i) {age=i, tall=40, cout＜＜"A old person. "＜＜end1;} person(int i, int i) { age = i; tall = j; cout ＜＜" a old person with tall. "＜＜ end1；} ～person( ) {cout＜＜" person dead. "＜＜end 1；} void show() { cout＜＜"age= "＜＜age＜＜" ,tall= "＜＜tall＜＜end1; }};void main(){ person * ptr; ptr = new person[3]; ptr[0]=person ( ) ptr[1]=person(18); ptr[2]=person(20,120); for(int i=0;i＜3; i++) ptr[i]. show( ); ______}