void setVar (int a, int b, float c){ x = a; y = b; z = c; }
public void setVar(int a, float c, int b) { setVar(a, b, c); }
public void setVar(int a, float c, int b) { this(a, b, c); }
public void setVar(int a, float b){ x = a; z = b; }
public void setVar(int ax, int by, float cz) { x = ax; y = by; z = cz; }
第1题:
有如下类定义:
class Point{
public:
Point(int xx=0,int yy=0):x(xx),y(yy) { }
private:
int x,y;
};
class Circle:public Point{
public:
Circle(int r):radius(r) { }
private:
int radius;
};
派生类Circle中数据成员的个数是( )。
A、3
B、1
C、5
D、2
答案:A
解析:本题考查默认构造函数和带参数的构造函数,题目中定义一个对象a(2)以及对象数组b[3],共执行3次构造函数,对象指针不调用构造函数。
第2题:
有以下程序: #include <iostream> using namespace std; #define PI 3.14 class Point { private: int x,y; public: Point(int a,int b) { x=a; y=b; } int getx() { return x; } int gety() { return y; } }; class Circle : public Point { private: int r; public: Circle(int a,int b,int c):Point(a,b) { r=c; } int getr() { return r; } double area() { return PI*r*r; } }; int main() { Circle c1(5,7,10); cout<<cl.area()<<endl; return 0; } 程序执行后的输出结果是
A.314
B.157
C.78.5
D.153.86
第3题:
( 31 )有如下程序
#include <iostream>
using namespace std;
Class Base{
public:
Base(int x=0):valB(x) {cout<<valB;}
~Base() {cout<<valB;}
private:
int valB;
};
class Derived:public Base{
public:
Derived(int x=0,int y=0):Base(x),valD(y){cout<<valD;}
~Derived() {cout<<valD; }
private:
int valD;
};
int main(){
Derived obj12(2,3);
retuen 0;
}
运行时的输出结果是
A ) 2332
B ) 2323
C ) 3232
D ) 3223
第4题:
有以下程序: #include<iostrearn> using namespace std; class sample { private: int x; static int y; public: sample (int A) ; static void print (sample s); }; sample::sample(int A) { x=a; y+=x; }
A.x=10,y=20
B.x=20,y=30
C.x=30,y=20
D.x=30,y=30
第5题:
有以下程序: #include<iostream> using namespace std; #definePl 3.14 Class Point {private: int x,y; public: Point(int a,intB) {X=a; y:b;} int getx() <return x;} int gety() {return y;}}; class Circle:public Point {pri
A.314
B.157
C.78.5
D.153.86
第6题:
完成下列类的构造函数,初始化语句为______。
include<iostream.h>
class Test
{
private:
int x,y;
public:
void Test(int initx,int inity){
______
}
void printx( ){cout<<x<<"-"<<y<<"="<<x-y;}
};
void main( )
{
Test x(300,200);
x.printx( );
}
第7题:
有以下程序: #include <iostream> using namespace std; class A { private: int x,y; public: void set (int i,int j) { x=i; y=j; } int get_y() { return y; } }; class box { private: int length,width; A label; public: void set(int 1,int w, int s,int p) { length=1; width=w; label.set(s,p); } int get_area() { return length*width; } }; int main() { box small; small.set(2,4,1,35); cout<<small.get_area()<<end1; return 0; } 运行后的输出结果是( )。
A.8
B.4
C.35
D.70
第8题:
有如下程序: #include<iostream> using namespace std; Class TestClass { private: int x,y; public: TestClass(int i,int j) { x=i; y=j; } void print() { cout<<“print1”<<endl; } void print()const { cout<<”prin
A.printl
B.print2
C.printl print2
D.程序编译时出错。
第9题:
若有以下程序: #include <iostream> using namespace std; class Base { private: int a,b; public: Base(int x, int y) { a=x; b=y; } void show() { cout<<a<<", "<<b<<end1; } }; class Derive : public Base { private: int c, d; public: Derive(int x, int y, int z,int m):Base(x,y) { c=z; d=m; } void show() { cout<<c<<", "<<d<<end1; } }; int main ( ) { Base b(50,50) ,*pb; Derive d(10,20,30,40); pb=&d; pb->show {); return 0; }
A.10,20
B.30,40
C.20,30
D.50,50
第10题:
若有以下程序: #include<iostream> using namespace std; class A { private: int a; public: void seta(int x) { a=x; } void showa() { cout<<a<<","; } }; class B { private: int b; public: void setb(int x) { b=x; } void showb() { cout<<b<<",”; } }; class C:pUblic A,private B { private: int c; public: void setc(int x,int y,int z) { c=z; seta(x); setb(y); } void showc() { showa(); showb(); cout<<c<<end1; } }; int main() { Cc; c.setc(1,2,3); c.showc(); retrun 0; } 程序执行后的输出结果是
A.1,2,3
B.1,1,1
C.2,2,2
D.3,3,3