#include<iostream>
using namespace std;
class teacher
{
public:
     teacher(char s[10],int a,int b,int c,int d);
private:
    char name[10];
    int wage;
    int fwage;
    int bonus;
    int total;
   
};
teacher::teacher(char s[10],int a,int b,int c,int d)
{
    strcpy(name,s);
    wage=a;
    fwage=b;
    bonus=c;
    d=a+b+c;
    total=d;
}
void main()
{

        teacher teach[5]={teacher("贾宇",2300,1980,2000,0),teacher("张莹",1908,2000,1000,0),teacher("李蒙",2490,1080,980,0),
            teacher("王同辽",980,1200,680,0),teacher("叶库伦",1290,1800,390,0)};
        teacher*q=teach;
        
}

听不懂，瞎猜猜

#include <iostream>
#include <string>

class teacher
{
public:
    teacher( const std::string& name, int wage, int fwage, int bonus );
private:
    std::string name_;
    int wage_;
    int fwage_;
    int bonus_;
    int total_;

    friend bool operator<( const teacher& lhs, const teacher& rhs ) noexcept;
    friend std::ostream& operator<<( std::ostream& os, const teacher& t );
};

teacher::teacher( const std::string& name, int wage, int fwage, int bonus )
                : name_(name), wage_(wage), fwage_(fwage), bonus_(bonus), total_(wage+fwage+bonus)
{
}

bool operator<( const teacher& lhs, const teacher& rhs ) noexcept
{
    return lhs.total_ < rhs.total_;
}

std::ostream& operator<<( std::ostream& os, const teacher& t )
{
    return os << '(' << t.name_ << ',' << t.wage_ << ',' << t.fwage_ << ',' << t.bonus_ << ',' << t.total_ << ')';
}

#include <algorithm>
//#include <iterator>
using namespace std;

int main( void )
{
    teacher teach[] = { teacher("贾宇",  2300,1980,2000)
                      , teacher("张莹",  1908,2000,1000)
                      , teacher("李蒙",  2490,1080, 980)
                      , teacher("王同辽", 980,1200, 680)
                      , teacher("叶库伦",1290,1800, 390) };

    //copy( begin(teach), end(teach), std::ostream_iterator<teacher>(cout,"\n") );

    auto itor = max_element( begin(teach), end(teach) );
    cout << *itor << endl;
}

谢谢版主！！！但是作为c++新手我不太懂bool operator<( const teacher& lhs, const teacher& rhs ) noexcept
  friend bool operator<( const teacher& lhs, const teacher& rhs ) noexcept;
    friend std::ostream& operator<<( std::ostream& os, const teacher& t );这些是什么函数？望指教。

你用的是什么编译器，怎么连 noexcept specifier 都不认识？不过，没关系，你将noexcept删掉即可。

bool operator<( const teacher& lhs, const teacher& rhs )
是比较两个 teacher 对象的大小。
比如 teacher a=……, b=……;
a < b 即调用 operator<(a,b)

std::ostream& operator<<( std::ostream& os, const teacher& t );
是输出 teacher 对象
比如 cout << a 即调用 operator<<(cout,a)

一个对象就是一个老师，没有最大问题。
只有管理所有老师的人，才能计算最大值。
因此，应该单独设置一个管理类，包含所有老师，类中设置一个方法，来求最大值。

谢谢！谢谢版主！

谢谢！启发很大