/// 7. structures

#include<bits/stdc++.h>
using namespace std;

struct people{ // define data type that you want

    // data
    int age;
    double height,weight;
    pair<int,int> birthday;

    // constructor
    people(int a,double h,double w,pair<int,int> bir){
        age=a,height=h,weight=w;
        birthday=bir;
    }

    // member functions
    double get_bmi(){
        return weight/(height*height);
    }
    void lose_weight(double w){
        weight-=w;
    }
    void grow(){
        age++;
    }

}; /// *** REMEMBER to add ';' after the structure declaration ***

signed main(){

    double unknown=double(rand()/7000);
    people DA(16,180.1,60.0,make_pair(05,05));
    // call the constructor
    people Celine(16,158.0,unknown,make_pair(09,10));

    poeple _3t; // call the empty constructor

    DA.grow(); // member functions need to call by an object
    Celine.lose_weight(2.1);
    cout << Celine.get_bmi() << endl;

    /// ** Don't forget to add ';' at the end of the statement **
}