// 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:

friend istream& operator>>(istream& is,HD &b);

friend ostream& operator<<(ostream& os,HD b);

friend int ktra(HD);

int operator>(HD);

friend float gt(HD);

};

istream& operator>>(istream& is,HD &b)

{ fflush(stdin);

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

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

cout<<"nhap 1-neu phieu nhap // nhap 0-neu phieu xuat:";is>>b.lp;

cout<<"nhap ngay thang nam lap:

";is>>b.ngay>>b.thang>>b.nam;

cout<<"nhap khoi luong(kg)vat tu: ";is>>b.kl;

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

b.tt=b.kl*b.dg;

return(is);

}

ostream& operator<<(ostream& os,HD b)

{

os<<b.ma<<'

'<<b.ten<<'

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

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

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

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

return(os);

}

int ktra(HD b)

{

if(b.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++)

{ cin>>a[i]; cout<<'

'; } clrscr();

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++)

{ cout<<a[i];

if(ktra(a[i])) 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();

}