#include <iostream>#include <string>using namespace std;void main(){?struct student?{??int num;??char name[20];??????? float score1;??float score2;??float score3;?}stu[5];?int i;?float sum1=0,sum2=0,sum3=0;?cout<<"請輸入五個學(xué)生的信息（按學(xué)號，姓名，三門成績的順序）"<<endl;?for(i=0;i<5;i++)??? cin>>stu[i].num>>stu[i].name>>stu[i].score1;??? cin>>stu[i].score2>>stu[i].score3>>endl;?for(i=0;i<5;i++)?{? sum1=stu[i].score1;??? sum2=stu[i].score2;??? sum3=stu[i].score3;?}?sum1=sum1/5;?sum2=sum2/5;?sum3=sum3/5;?cout<<"每門的平均分為"<<endl;?cout<<"第一門："<<sum1<<" "<<"第二門："<<sum2<<" "<<"第三門："<<sum3<<endl;}為什么會出現(xiàn)：error C2679: binary '>>' : no operator defined which takes a right-hand operand of type '' (or there is no acceptable conversion)