有如下类定义: class Test { public: Test(){a=0;c=0} //① int f(int a)const{this->a=a;} //② static int g(){return a;} //③ void h(int b){Test::b;}; //④ private: int a; static int b; const int C; }; int Test::b=0; 在标注号码的行中,能被正确编译的是( )。A.①B.②C.③D.④
有如下类定义: class Test { public: Test(){a=0;c=0} //① int f(int a)const{this->a=a;} //② static int g(){return a;} //③ void h(int b){Test::b;}; //④ private: int a; static int b; const int C; }; int Test::b=0; 在标注号码的行中,能被正确编译的是( )。
A.①
B.②
C.③
D.④
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有如下类定义:class Test{public:Test(){ a = 0; c = 0;} // ①int f(int a)const{this-a = a;} // ②static int g(){return a;} // ③void h(intB . {Test::b = b;}; // ④private:int a;static int b;const int c;};int Test::b = 0;在标注号码的行中,能被正确编译的是A . ①B . ②C . ③D . ④
有如下程序:include using namespace std;class Test{public:Test(){n+=2; }~Test(){ 有如下程序: #include <iostream> using namespace std; class Test { public: Test() {n+=2; } ~Test() {n-=3; } static int getNum() {return n; } private: static int n; }; int Test::n=1; int main() { Test* p=new Test; delete p; cout<<"n="<<Test::getNum()<<endl; return 0; } 执行该程序的输出结果是( )。A.n=0B.n=1C.n=2D.n=3
有如下类定义: class Test { public: Test(){a=0;c=0;} //① int f(int a)const {this->a=a;} //② static int g(){return a;} //③ void h(int b){Test::b=b;}; //④ private: int a; static int b; const int c; }; int Test::b=0; 在标注号码的行中,能被正确编译的是A.①B.②C.③D.④
已知程序中已经定义了函数test,其原型是int test(int, int, int);,则下列重载形式中正确的是A.char test(int,int,int);B.double test(int,int,double);C.int test(int,int,int=0);D.float test(int,int,float=3.5F);
有如下类定义: class Test { public: Test{a=0;c=0;}//① int f(im A.const{this-a=a;}//② static int g{return a;f//③ void h(int B.{Test:.b=b;};//④ private: int a; static int b; const int C; }; int Test::b=0: 在标注号码的行中,能被正确编译的是( )。A.①B.②C.③D.④
有如下类定义: class Test { int x_,y_; public: Test ():a_(0) ,b_(0) {} Test(int a,int b=0) :a_(a),b_(b){} }; 若执行语句 Test x(2) ,y[3],*z[4]; 则Test类的构造函数被调用的次数是( )。A.2次B.3次C.4次D.5次
已知程序中已经定义了函数test,其原型是int test (int,int,int);,则下列重载形式中正确的是( )。A.char test(int, int, int);B.double test (int,int,double);C.int test(int ,int, int=0);D.float test(int,int,float=3.5F);
如下程序编译时发生错误,错误的原因是show函数实现语句错误,则正确的语句应该为______。include<iostream.h>class test{private:int hum;public:test(int);void show( );};test::test(int n){num=n;}test::show( ){cout<<num<<endl;}void main( ){test T(10):T.show( );}
阅读下列说明和C++代码,填写程序中的空(1)~(6),将解答写入答题纸的对应栏内。【说明】以下C++代码实现一个简单绘图工具,绘制不同形状以及不同颜色的图形。部分类及其关系如图6-1所示。【C++代码】#include?#include?using?namespace?std;class?DrawCircle?{??????//绘制圆形,抽象类? ? ? public: (1);//定义参数为?int?radius,?int?x,?inty? ?virtual~DrawCircle()?{?}};class?RedCircle:public?DrawCircle?{????//绘制红色圆形? ? ? ? public: void?drawCircle(intradius,?int?x,?int?y)?{cout??drawCircle?=?drawCircle;? }? ?virtual~shape()?{?}? public:? ?virtual?void?draw()?=?0;};class?Circle:public?Shape?{????//圆形? ? private:? ? ?int?x,y,radius;? ? public:? Circle(int?x,inty,int?radius,DrawCircle?*drawCircle)? (3)? {? this->x?=?x;? ?this->y?=?y;? ? this->radius?=?radius; }? ? ? public:? void?draw(){? drawCircle?-> (4); }};int?main(){Shape?*redCirclenew?Circle(100,100,10,????(5)????);//绘制红色圆形? Shape?*greenCircle=new?Circle(100,100,10, (6)??);//绘制绿色圆形redCircle >draw();? ?greenCircle?->draw();? ?return?0;}