编译器说倒数第三行有错....

#include<iostream>
using namespace std;
class Student
{
    public:
        Student(int n,int s):number(n),score(s){}
        static float average(Student stu[]);
        void data();
    private:
        int number,score;
        static int Average,sum; 
};

int Student::Average=0;
int Student::sum=0;

void Student::data()
{
    cout<<"Please input data:"<<endl;
    cin>>number>>score;         
}

float Student::average(Student stu[])
{
    int i,j,k;
    cout<<"The number of students that you want to calculate is:"<<endl;
    cin>>j;
    for(i=0;i<j&&j<=3;j++)
        {
        sum=sum+stu[i].score;
        }
    Average=sum/i; 
    return(Average);
}

int main()
{
    Student stu[3]={Student(1,90),Student(2,91),Student(3,92)};
    int k;
    for(k=0;k<3;k++)
        {
            stu[k].data();
        }
    Student::average(stu[]);
    return 0;
}
![图片说明](https://img-ask.csdn.net/upload/202002/08/1581130028_460369.png)

average函数参数实际是要输入一个地址，变量stu是个数组，本质是内存地址
Student::average(stu);

#include
using namespace std;
class Student
{
public:
Student(int n,int s):number(n),score(s){}
static float average(Student stu[]);
void data();
private:
int number,score;
static int Average,sum;
};

int Student::Average=0;
int Student::sum=0;

void Student::data()
{
cout<<"Please input data:"< cin>>number>>score;

}

float Student::average(Student stu[])
{
int i,j,k;
cout<<"The number of students that you want to calculate is:"< cin>>j;
for(i=0;i<j&&j<=3;j++)
{
sum=sum+stu[i].score;
}
Average=sum/i;
return(Average);
}

int main()
{
Student stu[3]={Student(1,90),Student(2,91),Student(3,92)};
int k;
for(k=0;k<3;k++)
{
stu[k].data();
}
Student::average(stu[]);
return 0;
}

#include<iostream>
using namespace std;
class Student
{
    public:
        Student(int n,int s):number(n),score(s){}
        static float average(Student stu[]);
        void data();
    private:
        int number,score;
        static int Average,sum; 
};

int Student::Average=0;
int Student::sum=0;

void Student::data()
{
    cout<<"Please input data:"<<endl;
    cin>>number>>score;         
}

float Student::average(Student stu[])
{
    int i,j,k;
    cout<<"The number of students that you want to calculate is:"<<endl;
    cin>>j;
    for(i=0;i<j&&j<=3;j++)
        {
        sum=sum+stu[i].score;
        }
    Average=sum/i; 
    return(Average);
}

int main()
{
    Student stu[3]={Student(1,90),Student(2,91),Student(3,92)};
    int k;
    for(k=0;k<3;k++)
        {
            stu[k].data();
        }
    Student::average(stu[]);
    return 0;
}