#include <iostream>
using namespace std;
struct student_info
{
 string strName;
 int chinese;
 int math;
 int english;
};
student_info student[50];
void inputInfo()
{
 int i=0;
 char a[20];
 for( i=0; i<50; i++)
 {
  cout<<"Enter the"<<i+1<<"student's information:"<<endl;
  cout<<"Enter name:"<<endl;
  cin>>a;
  student[i].strName=a;
  cout<<"Enter Chinese performance:"<<endl;
  cin>>student[i].chinese;
  cout<<"Enter Math performance:"<<endl;
  cin>>student[i].math;
  cout<<"Enter English performance:"<<endl;
  cin>>student[i].english;
 }
 
 void outputInfo();
 {
  int i=0;
  for( i=0; i<50; i++)
  {
   cout<<"The"<<i+1<<"student's information:"<<endl;
   cout<<"Name:"<<student[i].strName.c_str()<<endl;
   cout<<"Chinese performance:"<<student[i].chinese<<endl;
   cout<<"Math performance:"<<student[i].math<<endl;
   cout<<"English performance:"<<student[i].english<<endl;
  }
 }
 void computResult();
 {
  int avgChinese=0;
  int avgMath=0;
  int avgEnglish=0;
  int total=0;
  int i=0;
  while(i<50)
  {
   total += student[i].chinese;
   i++;
  }
  avgChinese=total/50;
  total=0;
  i=0;
  while(i<50)
  {
   total += student[i].math;
   i++;
  }
  avgMath=total/50;
  total=0;
  i=0;
  while(i<50)
  {
   total +=student[i].english;
   i++;
  }
  avgEnglish=total/50;
  cout<<"Enter 1 for look up the average of Chinese.\n"
   <<"Enter 2 for look up the average of Math.\n"
   <<"Enter 3 for look up the average of English.\n";
  cin>>i;
  switch(i)
  {
  case 1:
   cout<<"Average of Chinese is:"<<avgChinese<<endl;
   break;
  case 2:
   cout<<"Average of Math is:"<<avgMath<<endl;
   break;
  case 3:
   cout<<"Average of English is:"<<avgEnglish<<endl;
   break;
  default:
   cout<<"Please enter 1,2or3"<<endl;
   break;
  }
 }
 int main()
 {
  inputInfo();
  outputInfo();
  computResult();
  cin.get();
  return 0;
 }
}