#include <iostream>
using namespace std;

struct Student{
        int ID;
        char name[20];
        int marks;
};

void sortByMarks(Student arr[], int length);

int main(){
    struct Student stu[3];

    for(int i=0; i<3; i++){
        cout<<"Enter ID, name and marks of student "<<i+1<<" : \n";
        cin>>s[i].id>>stu[i].name>>stu[i].marks;
    }

    sortByMarks(stu,3);

    for(int i=0; i<3; i++){
        cout<<stu[i].id<<"\t"<<stu[i].name<<"\t"<<stu[i].marks<<"\n";
    }


    return 0;
}

void sortByMarks(Student arr[], int length){
    bool didSwap;
    Student temp;

    do{
        didSwap = false;

        for (int i=0; i<length-1; i++){
            if (arr[i].marks> rr[i+1].marks){
                temp=arr[i];
                arr[i]=arr[i+1];
                arr[i+1]=temp;
                didSwap=true;
            }
        }
    }
    while(didSwap);
}