// quan ly hoa don

#include<iostream.h>

#include<conio.h>

#include<iomanip.h>

#include<stdio.h>

class HD

{ char ma[10],ten[25];

int lp,ngay,thang,nam;

float kl,dg,tt;

public:

void nhap();

void in();

int ktra();

int operator>(HD);

friend float gt(HD);

};

void HD::nhap()

{ fflush(stdin);

cout<<"nhap ma vat tu: ";gets(ma);

cout<<"nhap ten vat tu: ";gets(ten);

cout<<"nhap 1-neu phieu nhap // nhap 0-neu phieu xuat:";cin>>lp;

cout<<"nhap ngay thang nam lap:

";cin>>ngay>>thang>>nam;

cout<<"nhap khoi luong(kg)vat tu: ";cin>>kl;

cout<<"nhap don gia(vnd/kg)vat tu: ";cin>>dg;

tt=kl*dg;

}

void HD::in()

{

cout<<ma<<'

'<<ten<<'

'<<"loai phieu(1-nhap;0-xuat): "<<lp<<'

'<<setw(2)<<ngay<<"-"<<setw(2)<<thang<<"-"<<setw(4)<<nam<<'

'<<kl<<"kg-"<<dg<<"vnd/kg"<<"

thanh tien: "<<tt<<"vnd";

}

int HD::ktra()

{

if(lp==1) return(1);

else return(0);

}

int HD::operator>(HD b)

{

if((tt-b.tt)>0) return(1);

else return(0);

}

float gt(HD b)

{

return(b.tt);

}

main()

{ HD a[50]; int n;float s=0;

cout<<"nhap so luong vat tu: ";cin>>n;

for(int i=0;i<n;i++)

{ a[i].nhap(); cout<<'

'; }

for(i=0;i<n-1;i++)

for(int j=i+1;j<n;j++)

if(a[j]>a[i])

{ HD tg=a[i];

a[i]=a[j];

a[j]=tg;

}

for(i=0;i<n;i++)

{ a[i].in();

if(a[i].ktra()) cout<<"

la phieu nhap

";

else cout<<"

la phieu xuat

";

}

for(i=0;i<n;i++)

{ s=s+gt(a[i]); }

cout<<"

tong gia tri cac hoa don: "<<s<<"vnd";

getch();

}