#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
using namespace std;
int main()
{
string line;
int head=0,count=0,num;
float math,english,sum_math=0,sum_english=0,average;
ifstream ifs("chengji.txt");
if(!ifs) return -1;
ofstream ofs("chengji_result.txt");
if(!ofs) return -2;
while(getline(ifs,line))
{
istringstream is(line);
if(head==0)
{
//跳过第一行的表头
head=1;
continue;
}
is>>num>>math>>english;
if(count==0)
{
ofs<<"学生编号\t平均成绩"<<endl;
}
ofs<<num<<"\t"<<(math+english)/2<<endl;
sum_math+=math;
sum_english+=english;
count++;
}
if(count>0)
{
ofs<<endl;
ofs<<"数学平均成绩:"<<sum_math/count<<endl;
ofs<<"英语平均成绩:"<<sum_english/count<<endl;
}
ifs.close();
ofs.close();
return 0;
