有如下函数模板： template T square(T x) { return x * x; } 其中的 T 是

单项选择题有如下程序：#include#includeusing namespace std;class Animal{public:virtual string GetType() const { return Animal ; }virtual string GetVoice() const { return Voice ; }};class Dog:public Animal{public:string GetType() const { return Dog ; }string GetVoice() const { return Woof ; }};class Cat:public Animal{public:string GetType() const { return Cat ; }string GetVoice() const { return Miaow ; }};void Type(Animal a) { cout<<a.GetType(); }void Speak(Animal& a) { cout<<a.GetVoice(); }int main() {Dog d; Type(d); cout<< speak ; Speak(d); cout<< - ;Cat c; Type(c); cout<< speak ; Speak(c); cout<<endl;return 0;}运行时的输出结果是

单项选择题有如下程序：#include#includeusing namespace std;class Father{public:Father(string s):name(s) { cout<<’F’; }~Father() { }private:string name;};class Mother{public:Mother(string s):name(s) { cout<<’M’; }~Mother() { }private:string name;};class Child:public Mother,public Father{public:Child(string s1,string s2,string s3,int a):Father(s1),Mother(s2),name(s3),age(a) { cout<<’C’; }~Child() { }private:string name;int age;};int main(){Child son( Zhang , Li , Ming ,20);return 0;}运行时的输出结果是