简易学生成绩管理系统(c++)

#include "stdafx.h"
#include "stdlib.h"
#include "iostream.h"

int main(int argc, char* argv[])
{
int select;
int i,j;
int score[2][3];
int average=0;
int sum=0;

for(i=0;i<2;i++)
{
for(j=0;j<3;j++)
{
score[i][j]=0;
}
}

do
{
cout<<"学生成绩查询系统"<<endl;
cout<<"1,根据学号查询该学生平均成绩"<<endl;
cout<<"2,根据考试号查询该科成绩"<<endl;
cout<<"3,根据考试号和学号查询学生成绩"<<endl;
cout<<"4,录入学生成绩"<<endl;
cout<<"0,退出"<<endl;
cout<<"请输入（0——4）:"<<endl;

cin>>select;
cout<<endl;

switch(select)
{
case 0:
cout<<"OK"<<endl;
exit(0);
break;
case 1:
cout<<"请输入学号:"<<endl;
cin>>i;
for(j=0;j<3;j++)
{
cout<<"第 "<<j<<" 科成绩是 "<<score[i][j]<<" ";
sum+=score[i][j];
}
average=sum/2;
cout<<"学生的平均成绩是 "<<average<<endl;
break;
case 2:
cout<<"输入考试号:";
cin>>j;
cout<<endl;
for(i=0;i<2;i++)
{
cout<<"第 "<<j<<" 号学生成绩是 "<<score[i][j]<<" ";
sum+=score[i][j];
}
average=sum/3;
cout<<"本科平均成绩是 "<<average<<endl;
break;
case 3:
cout<<"输入学号和考试号:"<<endl;
cin>>i>>j;
cout<<endl;
cout<<"第 "<<i<<" 号学生的第 "<<j<<" 科考试成绩是 "<<score[i][j];
break;
case 4:
cout<<"请输入成绩"<<endl;
for(i=0;i<2;i++)
{
for(j=0;j<3;j++)
{
cin>>score[i][j];
}
}
cout<<endl;
break;
default:
break;
}
}while(1);

return 0;
}