Write a complete program to read student data from the standard input, sort it b

Question

Write a complete program to read student data from the standard input, sort it by last name / first name , and print out the result to standard output . The student data consists of a lastname , first name , and a grade point average (a floating point  value ). You should assume no more than 50 students.

Note, in this exercise you will need implement your own sort-- you should not rely on an external library function to do the sort.

SAMPLE INPUT:

Ware Henry 87.2
Dantes Edmond 91.4
Earhart Amelia 92.6

Given the above input the program would write the following to standard output :

Dantes Edmond 91.4
Earhart Amelia 92.6
Ware Henry 87.2

My Code

#include <iostream>
#include <sstream>
#include <string>
#include <algorithm>
using namespace std;

class student
{
public:
string fName;
string lName;
float gpa;

student() {};
student(string last, string first, double grade)
{
fName = first;
lName = last;
gpa = grade;
};
};

int main()
{
string first;
string last;
float grade;

student list[50];

int count = 0;
std::string line;
std::getline(cin, line);
std::istringstream iss(line);

cout<<"input data: ";
while ((iss >> last) && (iss >> first) && (iss >> grade))
{
list[count].lName = last;
list[count].fName = first;
list[count].gpa = grade;
cout <<"student: "<< last << " " << " " << first << " " << grade << endl;
count++;
}

for ( int i = 0; i < count-1; i++)
{
if (list[i].lName > list[i + 1].lName)
{
swap (list[i], list[i+1]);
}
}

for(int i = 0; i < count; i++)
{
cout << list[i].lName << " " << list[i].fName << " " << list[i].gpa << endl;
}

return 0;
}

My programming lab doesn't accept this answer. It tests the code and says it should out put

Explanation / Answer

#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
class student
{
    public:
    string firstName;
    string lastName;
    float gpa;
    student()
    {};
    student(string last, string first, double grade)
    {
        firstName = first;
        lastName = last;
        gpa = grade;
    };
};
int main()
{
    string first;
    string last;
    float grade;
    int size = 2;
    student list[size];
    for(int i = 0;i < size; i++)
    {
        cin >> last;
        cin >> first;
        cin >> grade;
        list[i].lastName = last;
        list[i].firstName = first;
        list[i].gpa = grade;
    }
    /** Sort by last name**/
    for ( int i = 0; i < size; i++)
    {
        for(int j = 0; j < size - i - 1; j++)
        {
            if (list[i].lastName > list[i + 1].lastName)
            {
                swap (list[i], list[i+1]);
            }
        }
    }

    /** sort by first name
    for ( int i = 0; i < size; i++)
    {
        for(int j = 0; j < size - i - 1; j ++)
        {
            if (list[i].firstName > list[i + 1].firstName)
            {
                swap (list[i], list[i+1]);
            }
        }
    }

    **/
    for(int i = 0; i < size; i++)
    {
        cout <<list[i].lastName <<" " <<list[i].firstName <<" " <<list[i].gpa <<endl;
    }
    return 0;
}

//Sample output

Executing the program....
$demo

/** Please change the size variable to support more objects **/

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