刚学C 写得程序咋运行不正确？谢谢

咋程序还是运行不正确  第2个函数要求用指针参数  谢谢了！

/*----------------------------------
name:CHENG HAN
Data:11-10-27
Function:班级课程成绩计算(计算5个学生的平均成绩和每门课的平均成绩）
----------------------------------*/
#include<iostream>
using namespace std;
int num[5]={1,2,3,4,5};
int sco[5][5]={{50,60,70,80,90},{60,50,70,55,60},{58,60,79,80,98},{85,65,45,98,76},{80,60,65,75,65}};
float avsco[5];
class grade{     //定义一个名为“grade”的类
public :
    void averscore(int sco[5][5],float avsco[5]) //定义一个函数用来计算每个学生的平均成绩
    {
        int i,j,s;
        for(i=0;i<5;i++) {
            s=0;

            for(j=0;j<5;j++) {
                s=s+sco[i][j];
            }
            avsco[i]=s/5.0;
        }
    }

    void avercourse(float *psco,int n)   //定义一个函数计算每门课的平均成绩
    {
        int i,j,s;
        for(j=0;j<5;j++) {
            s=0;
            for(i=0;i<5;i++)
            {
                s=s+sco[i][j];
            }
            psco[j] = s/5.0;
        }
      
        switch(n)
        {
        case 1: cout<<"first lie avgrade="<<*psco<<endl;
            break;
        case 2: cout<<"second lie avgrade="<<*(psco+1)<<endl;
            break;
        case 3: cout<<"third lie avgrade="<<*(psco+2)<<endl;
            break;
        case 4: cout<<"forth lie avgrade="<<*(psco+3)<<endl;
            break;
        case 5: cout<<"fifth lie avgrade="<<*(psco+4)<<endl;
            break;
        default:cout<<"input error!" ;
        }
    }
};
void main()
{
    int i,n;
    grade A;
    A.averscore(sco,avsco);
    for(i=0;i<5;i++)
        cout<<num[i]<<" "<<avsco[i]<<endl;
    cout<<"please input n:"<<endl;
    cin>>n;

    float avs[5] = {0};

    A.avercourse(avs,n);
}