下列程序的输出结果是______。#include＜iostream＞using n

问题：

下列程序的输出结果是______。#include＜iostream＞using namespace std;class Test(public:Test() {cnt++;}～Test() {cnt--;}static int Count(){return cnt;}private:static int cnt;};int Test::cnt=0;int main(){cout＜＜Test::Count()＜＜"";Test t1,t2;Test*pT3=new Test;Test*pT4=new Test;cout＜＜Test::Count()＜＜"";delete pT4;delete pT3;cout＜＜Test::Count()＜＜end1;return 0;}

A．024

B．042

C．420

D．240