在下面的类定义中,this指针的用途是______。 include class Sample { int x,y; publi在下面的类定义中,this指针的用途是______。include<iostream.h>class Sample{int x,y;public:Sample(int i,int j){x=i;y=j;}void assign(Sample sa);};void Sample::assign(Sample p){if(this!=&p){x=p.x;y=p.y;}}
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已知一个类Sample,( )是定义指向类Sample成员函数的指针,假设类有三个公有成员:voidf1(int),void f2(int)和int a。A.Sample*pB.Int Samale::*pc=&Sample::aC.Void(Sample::*Pa)()D.Sample*P[10]
有以下程序include using namespace std;class sample{private:int x;public:sample(有以下程序#include <iostream>using namespace std;class sample{private: int x;public: sample(int a) { x=a; } friend double square(sample s);};double square(sample s){ return s. x*s. x;}int main(){ sample s1(20),s2(30); cout<<square(s2)<<end1; return 0;}执行结果是( )。A.20B.30C.900D.400
在下面的类定义中,错误的语句是class Sample { public: Sample(int val); //①~Sample(): //②private: int a=2.5; //③Sample(); //④ };A.①②③④B.②C.③D.①②③
Sample是一个类,执行下面语句后,调用Sample类的构造函数的次数是Sample a[2],*P=new Sample;A.0B.1C.2D.3
已知一个类Sample,( )是定义指向类Sample成员函数的指针,假设类有三个公有成员:voidfl(int),void f2(int)和int a。A.Sample*pB.Int Samale::*pc=&Sample::aC.Void (Sample::*Pa) ()D.Sample *P[10]
以下程序的执行结果是 ( )。include using namespace std;class sample{private: int以下程序的执行结果是 ( )。 #include <iostream> using namespace std; class sample { private: int x; public: sample (int A) { x=a; } friend double square(sample s); }; double square(sample s) {A.20B.30C.900D.400