地大23春c++程序设计-模拟测试答案非答案

admin · 发表于 2023-3-30 09:41:49

include<iostream.h>int change(int x,int &y,int &z,int *dp){ z=x--+--y; *dp=x-y--; return(x+y);}void main(){ int a=8,b=8,c=8,d=8; a=change(a,b,c,&d); cout<<a<<','<<b<<','<<c<<','<<d<<endl;}

[答案]:13,6,15,0

15.

admin · 发表于 2023-3-30 09:41:49

include<iostream.h>class CPoint{ private:int X,Y; public: CPoint(int i, int j) {X=i; Y=j;} virtual int Area(){ return 0;}};class CRectangle:public CPoint{ private:int W,H; public: CRectangle(int i, int j, int k, int l) :CPoint(i,j) {W=k; H=l; } int Area() {return W*H;}};void fun(CPoint &s) { cout<<"Area="<<s.Area()<<endl; }void main() { CRectangle r(2, 3, 6, 8); fun(r); }

[答案]:Area=48

16.

admin · 发表于 2023-3-30 09:41:49

include <iostream.h>int fun(int n){ int r; if(n==1||n==2) r=1; else r=fun(n-1)+fun(n-2); return r;}void main(){ cout<<fun(6)<<endl; }

[答案]:8

17.什么叫类?什么叫对象?

[答案]:类是封装了数据和方法的一种抽象数据类型(2分).

对象是类的一个实例(2分).18.在C++语言中,请说明结构体和联合体的异同点.

[答案]:结构体数据类型的变量可以同时存储int,long,char和double型等已有数据类型的数据,这些数据使用不同的存储空间,而联合体虽然表面上可以存储int,long,char或double等已有数据类型的数据,但它们共享其占用空间最多的成员所分配的存储空间,对某个成员赋值将影响其它成员的数值.

19.函数之间的参数传递的形式有哪几种?

[答案]:传值传递方式,地址传递方式,引用方式.

20.

admin · 发表于 2023-3-30 09:41:49

include <iostream.h>class B{ public: B(int i) { cout<<"constructing B "<<i<<endl; }};class C: public B{ public: C(int a, int b,int c):B(a),memberB(b) { cout<<"constructing C "<<c<<endl;}private: B memberB;};void main(){ C obj(1,2,3); }

[答案]:constructing B 1

constructing B 2

constructing C 321.

admin · 发表于 2023-3-30 09:41:49

include<iostream.h>class CPoint{ private:int X,Y; public: CPoint(int i, int j) {X=i; Y=j;} virtual int Area(){ return 0;}};class CTriangle:public CPoint{ private:int W,H; public: CTriangle (int i, int j, int k, int l) :CPoint(i,j) {W=k; H=l; } int Area() {return W*H/2;}};void fun(CPoint &s) { cout<<"Area="<<s.Area()<<endl; }void main() { CTriangle r(9, 8, 7, 6); fun(r); }

[答案]:Area=21

22.

admin · 发表于 2023-3-30 09:41:49

include <iostream.h>class myclass{private: int a,b; static int s; public: myclass(int x,int y){ a=x; b=y; s++; } ~myclass(){s--;} void print(){ cout <<s<< endl; }} ;int myclass::s=0;void main(){ myclass m1(1,2),m2(4,5); m1.print(); { myclass m3(6,7); m3.print(); } m2.print();}

[答案]:2

3

223.

admin · 发表于 2023-3-30 09:41:49

include <iostream.h>class point { private:int x,y; public: point(int a=0,int b=0){ cout <<"A object is created"<<endl; } ~point(){ cout<<"A object is destroyed"<<endl; } };void main(){ point a1,a2,*p;p= new point;}

[答案]:A object is created

A object is created

A object is created

A object is destroyed

A object is destroyed24.

admin · 发表于 2023-3-30 09:41:49

include<iostream.h>int t(int x,int &y,int *cp,int z){ --x; ++y; *cp=--x+y++; z=x+*cp ; return z; }void main(){ int a=3, b=3,c(3),d(3); d+=t(a,b,&c,d); cout<<a<<b<<c<<d<<endl; }

[答案]:3559

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地大23春c++程序设计-模拟测试答案非答案

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