C++ class output and sort

Question

I have a class student with parameters Number, Name, Grade and i have functions for input and output

  void insertdata(){
        cin>>number;
        cin>>name;
        cin>>grade;
    }
    void showdata() {
        cout<<number<<" "<<name<<" "<<grade<<endl;
    }

In the main function I'm inserting the data by this way

int n,i;
cin>>n;
student a;
for(i=0;i<n;i++){
    a.insertdata();
    a.showdata();
}

For example the progrom shows this

1 John 5
1 John 5
2 Ron 6
2 Ron 6

I want the input and output to be separate and sorted by grade: Input:

1 John 5
2 Ron 6

Output:

2 Ron 6
1 John 5

For the sorting i'm using this

bool operator()(student const & a, student const & b) {
        return a.success < b.success;
    }

If someone can help I will be grateful Thanks in advance :)

Can you please edit your question to include a simple but complete example? Also known as a SSCCE. — Some programmer dude
– Some programmer dude, Commented Dec 16, 2013 at 10:41

juanchopanza · Accepted Answer · 2013-12-16 11:12:16Z

2

You can use a predicate to pass to std:sort. For example:

bool by_grade_decr(student const & a, student const & b) {
    return a.grade > b.grade;
}

#include <algorithm> // for std::sort
#include <vector>

int main()
{
  std::vector<student> students = ....;
  std::sort(students.begin(), students.end(), by_grade_decr);
}

edited Dec 16, 2013 at 11:12

answered Dec 16, 2013 at 10:41

juanchopanza

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2 Comments

user3104718 Over a year ago

std::vector<student> students; std::sort(students.begin(), students.end(), by_grade); Says that students it's not a type

juanchopanza Over a year ago

@user3104718 that doesn't make sense. You must have an error or a typo somewhere.

alexbuisson · Accepted Answer · 2013-12-16 10:42:28Z

1

Use the STL. Vector for the storage and the sort algorithm.

int n,i;
cin>>n;
vector<Student> storage;
student a;
for(i=0;i<n;i++){
    a.insertdata();
    a.showdata();
    storage.push_back(a);
}

sort(storage.begin(), storage.end());

answered Dec 16, 2013 at 10:42

alexbuisson

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