若有以下程序:include using namespaces std;class A{public: A (){} A (int i) {x1= 若有以下程序: #include <iostream> using namespaces std; class A { public: A (){} A (int i) { x1=i; } void dispa() { cout<<"xl="<<xl<<" , "; } private: int x1; }; class B : public A { public: B (){} B (int i):A(i+10) { x2=i; } void dispb() { dispa (); cout <<"x2="<<x2<<end1; } private: int x2; }; int main () { B b(2); b.dispb (): return 0; } 程序运行后的输出结果是( )。A.x1=10,x2=2B.x1=12,x2=10C.x1=12,x2=2D.x1=2,x2=2

若有以下程序:include using namespaces std;class A{public: A (){} A (int i) {x1=

若有以下程序: #include <iostream> using namespaces std; class A { public: A (){} A (int i) { x1=i; } void dispa() { cout<<"xl="<<xl<<" , "; } private: int x1; }; class B : public A { public: B (){} B (int i):A(i+10) { x2=i; } void dispb() { dispa (); cout <<"x2="<<x2<<end1; } private: int x2; }; int main () { B b(2); b.dispb (): return 0; } 程序运行后的输出结果是( )。

A.x1=10,x2=2

B.x1=12,x2=10

C.x1=12,x2=2

D.x1=2,x2=2


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若有以下程序:includeusing namespaces std;class A{public: A(){} A(int i) {xl=i; 若有以下程序: #include<iostream> using namespaces std; class A { public: A(){} A(int i) { xl=i; } void dispa() { cout<<"x1="<<x1<<","; } private: int x1; }; class B:public A { public: B(){} B(int i):A(i+10) { x2=i; } void dispb() { dispa(); cout<<"x2="<<x2<<endl; } private: int x2; }; int main{) { B b(2); b.dispb(): return 0; } 程序运行后的输出结果是A.x1=10,x2=2B.x1=12,x2=10C.x1=12,x2=2D.x1=2,x2=2

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