可能重复：
如何对私有中声明的整数进行排序
我在如何对类中的 int id 元素进行排序时遇到问题，这是我为类放置函数的地方
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
#include "student.h"
#define cap 100
//Student constructor- empty
student::student()
{
id = 0;
first = "null";
last = "null";
age = 0;
gpa = 0.0;
}
//Student deconstructor
student::~student()
{
}
bool student::get(istream &in)
{
in >> id >> first >> last >> age >> gpa;
return(in.good());
}
void student::put(ostream &out)
{
out << id << first << last << age << gpa;
}
bool student::operator>(student)
{
if(student[i].id>student[i+1].id)
return true;
else
return false;
cout << student[i].id;
}
bool student::operator<(student)
{
if(student[i].id<student[i+1].id)
return true;
else
return false;
}
void student::sort_array()
{
int j,temp;
for(j=0;j<cap-1;j++)
{
//if out of position switch the out of align number
if(student[i].id<student[i+1].id)
{
temp = student[i].id;
student[i].id = student[i+1].id;
student[i+1].id = temp;
}
}
}
这是我的文件，以及显示和调用函数的主要代码
#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
using namespace std;
#include "student.h"
#define cap 100
void main()
{ string s;
class student student[cap],l;
int i;
fstream f;
i=0;
cout << "Enter the file name: "; //Display to enter the file name
cin >>s;
f.open(s.data(),ios::in);
if(!f.is_open())
cout << "could not open file";
while(i<cap && !f.eof())
{
student[i].get(f);
//Display if okay
if(f.good())
{
student[i].sort_array();
i++;
cout << i;
}
}
f.close();
}
这是我的课程代码和课程文件
#include <iostream>
using namespace std;
class student
{
public:
student(); //Constructor without parameters
student(int,string,string,int,float); //Constructor with parameters
~student(); //Deconstructors
bool get(istream &); //Input
void put(ostream &); //Output
bool operator==(student);
bool operator>(student);
bool operator<(student);
bool operator==(int);
bool operator>(int);
bool operator<(int);
int read_array(string,int);
void sort_array();
private:
int id,age;
float gpa;
string last,first;
};