c++编程题 类和对象
创建学生类(class Student),要求如下：
一、数据成员(私有)
1. 姓名：char *name;
2. 成绩：int *score;
3.保存成绩数的常量:const int N;
4.统计对象总数的静态变量：static int count;
二、函数成员（公开）
1. 无参构造函数：初始化常量为2；用new开辟name和score指向的实体存储空间；对象数统计变量count自增；
2.有参构造函数：根据传入参数初始化常量；用new开辟name和score指向的实体存储空间；用参数为数据成员赋值；对象数统计变量count自增；
3.拷贝构造函数：初始化常量；用new开辟name和score指向的实体存储空间；用对象参数为数据成员赋值；对象数统计变量count自增；
4.析构函数：用delete释放已有堆空间；对象数统计变量count自减；
5.对象姓名设置函数：SetName
6.对象成绩设置函数：SetScore（假设用户传入成绩数组的元素数等于N）
7.返回成绩数常量的函数：GetN
8.返回对象成绩数组的函数：GetScore
9.对象信息输出函数Print：输出当前对象的姓名以及所有成绩
三、测试函数main
void main()
{
int a[2]={40,60};
int b[4]={40,60,70,80};
Student s0,s1("zhang",b,4),s2(s1);
s0.SetName("li");
s0.SetScore(a);
s0.Print();
s1.Print();
s2.Print();
//your code here利用GetScore和GetN计算s2的平均成绩并输出。
//your code here调用GetCount返回当前对象总数并输出
}
答案：
/*
* Student.h
*
* Created on: 2011-10-29
* Author: kyle
*/
#ifndef STUDENT_H_
#define STUDENT_H_
#if defined (_STDDEF_H) || defined (__need_NULL)
#undef NULL/* in case <stdio.h> has defined it. */
#ifdef __GNUG__
#define NULL __null
#else /* G++ */
#ifndef __cplusplus
#define NULL ((void *)0)
#else /* C++ */
#define NULL 0
#endif /* C++ */
#endif /* G++ */
#endif/* NULL not defined and <stddef.h> or need NULL. */
#undef__need_NULL
class Student {
public:
Student();
Student(const char* name,const int*score,int N);
virtual ~Student();
void SetName(const char* name);
void SetScore(const int* score);
char* GetName();
int GetN();
int* GetScore();
int GetCount();
int GetAvgScore();
void print();
private:
char* name;
int* score;
const int N;
};
static int count;
#endif /* STUDENT_H_ */
/*
* Student.cpp
*
* Created on: 2011-10-29
* Author: kyle
*/
#include "Student.h"
#include<iostream>
#include<string.h>
#include<stdlib.h>
using namespace std;
Student::Student():N(2) {
// TODO Auto-generated constructor stub
//N=0;
this->name=NULL;
this->score=NULL;
count++;
}
Student::Student(const char* name,const int*score,int N) :N(N){
count++;
this->name=new char[strlen(name)+1];
strcpy(this->name,name);
this->score=new int[N];
int i;
for(i=0;i<N;i++) {
*(this->score)=*score;
score++;
(this->score)++;
}
this->score-=i;
}
Student::~Student() {
// TODO Auto-generated destructor stub
count--;
if(this->name!=NULL)
delete[] this->name;
if(this->score!=NULL)
delete[] this->score;
}
int Student::GetN (){
return N;
}
int* Student::GetScore() {
return this->score;
}
char* Student::GetName() {
return this->name;
}
int Student::GetCount() {
return count;
}
int Student::GetAvgScore() {
int sum=0;
if(this->score==NULL)
return 0;
for(int i=0;i<N;i++) {
sum+=*(this->score);
this->score++;
}
this->score-=N;
return sum/N;
}
void Student::print() {
cout<<"this student's name:"<<this->name<<endl;
cout<<"this student's scores:";
if(this->score==NULL) {
cout<<"0"<<endl;
return;
}
for(int i=0;i<N;i++) {
cout<<*(this->score)<<",";
this->score++;
}
cout<<""<<endl;
this->score-=N;
}
void Student::SetScore(const int* score) {
if(this->score!=NULL)
delete[] this->score;
int i=0;
for(;i<N;i++) {
*(this->score)=*score;
score++;
this->score++;
}
this->score-=N;
}
void Student::SetName(const char* name) {
//如果重复调用SetName的话，不做下面步骤就可能出现内存泄漏
if(this->name!=NULL)
delete[] this->name;
this->name=new char[strlen(name)+1];
strcpy(this->name,name);
}
我用gcc编译通过了哈
//VisualStudio2010亲测可用 #include<iostream>usingnamespacestd; classCircle{public: Circle(doubler=0):radius(r){} doubleArea(){return3.14*radius*radius;} frienddoublePerimeter(constCircle
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