C++学生成绩，构造函数，析构函数

[x519942447]

下面是自己写的程序，不会改错，请大家帮忙看一下并改正，可以的话告诉我原因，谢谢！！！

#include <iostream>
#include <string>
using namespace std;

class Student
{
public:
	Student(int,int,int);
	Student(Student &s);
	void getinformation();
	void inputinformation();
	void computesum();
	int getNum();
	int getEng();
	int getCom();
	int getSum();

	~Student(){};
private:
	int number;
	int english;
	int computer;
	
	
};
Student::Student(int Num,int Eng,int Com):number(Num),english(Eng),computer(Com)
{
	number=Num;
	english=Eng;
	computer=Com;
}
int Student::getNum()
{
	return number;
}
int Student::getEng()
{
	return english;
}
int Student::getCom()
{
	return computer;
}
int Student::getSum()
{
	return english+computer;
}

void Student::getinformation()
{
	cout<<"编号：	"<<getNum()<<endl;
	cout<<"英语成绩：	"<<getEng()<<endl;
	cout<<"计算机成绩：	"<<getCom()<<endl;
	
}
void Student::inputinformation()//输入函数
{
    int num,eng,com;
    cin>>num;
    cin>>eng;
	cin>>com;
}

void inputinformation()
{
	int num,eng,com;
	
	cout<<"编号：	";
	cin>>num;
	cout<<"英语成绩：	";
	cin>>eng;
	cout<<endl;
	cout<<"计算机成绩：	";
	cin>>com;
	
	Student s(num,eng,com);
	
	s.getinformation();
	
	
}
void Student::computesum()
{
	cout<<"考生成绩总和"<<english+computer<<endl;
}
void firstname(Student a[],int num)
{
	int i,j;
	for(i=0;i<num-1;i++)
	{
		a[i].getSum()>=a[i+1].getSum()?j=i:j=i+1;
	}
	cout<<"编号"<<a[j].getNum()<<"总成绩"<<a[j].getSum()<<endl;
}
void firstname(Student number[],int num)
{
	int i,j;
	for(i=0;i<num-1;i++)
	{
		number[i].getSum()>=number[i+1].getSum()?j=i:j=i+1;
	}
	cout<<"编号"<<number[j].getNum()<<"总成绩"<<number[j].getSum()<<endl;
}

int main()
{
int n;
	cout<<"学生数量；";
	cin>>n; 
	void firstname(Student a[],int num);//函数声明
	int i;
	Student stu[5];
	for(i=0;i<5;i++)
	{
		stu[i].inputinformation();
	}
	firstname(stu,5);
	
    return 0;
}

[codedoctor]

在类内部加一个默认构造函数就行了，因为new[]不支持其余构造函数 如下/.///的部分为添加的

class Student
{
public:
	Student() {}///////////////
	Student(int, int, int);
	Student(Student &s);
	void getinformation();
	void inputinformation();
	void computesum();
	int getNum();
	int getEng();
	int getCom();
	int getSum();

	~Student() {};
private:
	int number;
	int english;
	int computer;


};

[paschen]

firstname 函数定义了两次，而且参数类型完全相同，不能够成重载

[paschen]

其次，Student没有默认构造函数，Student stu[5];编译器不知如何构造你的对象