Chuong trinh xu ly da thuc


CODE:
#include<iostream.h>
#include<process.h>
#include<stdio.h>
#include<conio.h>
#include<graphics.h>
class dathuc{
   public:
      int bac;
      float heso[80];
      void nhapdt();
      void chuanhoa();
      void xuatdt();
      void gioithieu();
      dathuc operator + (dathuc);
      dathuc operator - (dathuc);
      dathuc operator * (dathuc);
      dathuc operator / (dathuc);
      dathuc operator - ();
  };
void dathuc::nhapdt(){
    int i=0;
    cout<<"             *Nhap bac toi da cua da thuc: ";
    cin>>bac;
    for(i=bac;i>=0;i--){
      cout<<"He so cua X"<<i<<":";
      cin>>heso[i];}
}
void dathuc::chuanhoa()
{
    while (bac>0&&heso[bac]==0) bac--;
}
void dathuc::xuatdt(){
    if (heso[bac]!=1||(heso[bac]==1&&bac==0))
       cout<<heso[bac];
    cout<<(bac>0?"X":"");
    if (bac>0) cout<<bac;
    int i=bac-1;
    while (i>0){
      if (heso[i] !=0){
 cout<<(heso[i]>0?"+":"");
 if (heso[i]!=1)
     cout<<heso[i];
 cout<<"X"<<i;
      }
      i--;
    }
    if (i==0&&heso[i]!=0)
    {
       cout<<(heso[i]>0?"+":"");
       cout<<heso[i];
    }
    cout<<endl;
}
dathuc dathuc::operator /(dathuc b)
{
dathuc dt3,dt4,dt5,dt;
int i,j,k;
b.chuanhoa();
if (b.heso[b.bac]!=0)// neu b khong phai la da thuc 0
 if (bac<b.bac){
      dt3.bac=0;
      dt3.heso[0]=0;
 }//if
  else
  {
  dt3.bac=bac-b.bac;
  for (i=0;i<=bac;i++) dt3.heso[i]=0;
  dt3.heso[bac-b.bac]=heso[bac]/b.heso[b.bac];
  dt=dt3*b;
  dt.chuanhoa();
  dt4=*this-dt;
  dt4.chuanhoa();
  k=dt4.bac;
  for (i=bac-1;i>=b.bac;i--)
  {
     if (dt4.bac>=b.bac)
     {
       dt3.heso[i-b.bac]=dt4.heso[k--]/b.heso[b.bac];
       dt5.bac=dt4.bac-b.bac;
       for (j=dt5.bac;j>=0;j--){dt5.heso[j]=0;}
       dt5.heso[dt5.bac]=dt3.heso[i-b.bac];
       dt5.chuanhoa();
       dt=dt5*b;
       dt.chuanhoa();
       dt4=dt4-dt;
       dt4.chuanhoa();
     }//if
   }//for
  }//else
else// neu b la dt 0
 {
    cout<<"Khong the chia cho da thuc 0"<<endl;
    dt3.bac=0;dt3.heso[0]=0;
 }
return dt3;
}
dathuc dathuc::operator + (dathuc b)
{
      dathuc tam;
      tam.bac=(bac<b.bac?b.bac:bac);//gan tam.bac=1 trong hai gia tri
      for (int i=0;i<=(bac>b.bac?b.bac:bac);i++)//hoac i<=tam.bac
tam.heso[i]=heso[i]+b.heso[i];
      while (i<=(bac<b.bac?b.bac:bac))
tam.heso[i++]=(bac<b.bac?b.heso[i]:heso[i]);
return tam;
}
dathuc dathuc::operator - (dathuc b){
      dathuc tam;
      tam.bac=(bac<b.bac?b.bac:bac);
      int i;
      for (i=0;i<=(bac>b.bac?b.bac:bac);i++)
      tam.heso[i]=heso[i]-b.heso[i];
      while (i<=(bac<b.bac?b.bac:bac))
      tam.heso[i++]=(bac<b.bac?-b.heso[i]:heso[i]);
return tam;
}
dathuc dathuc::operator * (dathuc b){
      dathuc tam;
      tam.bac=bac+b.bac;
      int i,j=0;
      for (i=0;i<=tam.bac;i++)
   tam.heso[i]=0;
      for (i=0;i<=bac;i++)
 for (j=0;j<=b.bac;j++)
    tam.heso[i+j]+=heso[i]*b.heso[j];
return tam;
}
dathuc dathuc::operator -()
{
      for (int i=0;i<=bac;i++)
   heso[i]=-heso[i];
return *this;
}
void dathuc::gioithieu()
{
     //textcolor(CYAN+BLINK);
     cout<<"\n         *************CHUONG TRINH XU LY DA THUC************";
     cout<<"\n         *                                                 *";
     cout<<"\n         *       Sinh vien thuc hien: dang van lap * " ;
     cout<<"\n  *                                                  *";
     cout<<"\n  *       Giao vien huong dan:..09059962226.        *";
     cout<<"\n  *                                                 *";
     cout<<"\n  ***************************************************";
}
void main()
{
     dathuc a,b,tong,hieu,tich,thuong,du,gt;
     textbackground(1);
     char chon;
     int exit=0;
     clrscr();
     gt.gioithieu();
     while (!exit)
     {
     cout<<"\n     --------------------       ";
     cout<<"\n     |       MENU       |       ";
     cout<<"\n    -----------------------------------";
     cout<<"\n    |   1. Nhap da thuc               |";
     cout<<"\n    |   2. Da thuc chuan hoa          |";
     cout<<"\n    |   3. Da thuc tong               |";
     cout<<"\n    |   4. Da thuc hieu               |";
     cout<<"\n    |   5. Da thuc tich               |";
     cout<<"\n    |   6. Da thuc thuong             |";
     cout<<"\n    |   7. Da thuc dao dau            |";
     cout<<"\n    |   8. Xoa man hinh               |";
     cout<<"\n    |   9. thoat chuong trinh         |";
     cout<<"\n    -----------------------------------";
     cout<<"\n                   moi ban chon cong viec:"; cin>>chon;
     switch (chon) {
     case '1':  a.nhapdt();
  b.nhapdt();
  getchar();
  break;
     case '2': a.chuanhoa();
  b.chuanhoa();
  cout<<"\n";
  cout<<"Da thuc thu 1 chuan hoa:";
  a.xuatdt();
  cout<<"\n";
  cout<<"Da thuc thu 2 chuan hoa:";
  b.xuatdt();
  getchar();
  break;
     case '3':  cout<<"\n";
  cout<<"Da thuc tong la:"<<endl;
  a.xuatdt();
  cout<<"+"<<endl;
  b.xuatdt();
  cout<<"-----------------------------"<<endl;
  tong=a+b;tong.chuanhoa();tong.xuatdt();
  break;
     case '4':  cout<<"\n";
  cout<<"Da thuc hieu la:"<<endl;
  a.xuatdt();
  cout<<"-"<<endl;
  b.xuatdt();
  cout<<"-----------------------------"<<endl;
  hieu=a-b;hieu.chuanhoa();hieu.xuatdt();
  getchar();
  break;
     case '5':  cout<<"\n";
  cout<<"Da thuc tich la:"<<endl;
  a.xuatdt();
  cout<<"*"<<endl;
  b.xuatdt();
  cout<<"-----------------------------"<<endl;
  tich=a*b;tich.chuanhoa();tich.xuatdt();
  getchar();
  break;
     case '6':  cout<<"\n";
  cout<<"Da thuc thuong la: ";
  thuong=a/b;thuong.chuanhoa();
  if (b.bac!=0||(b.bac==0&&b.heso[0]!=0))
  {
   thuong.xuatdt();
   cout<<"Da thuc du trong phep chia la: ";
   du=a-(thuong*b);
   du.chuanhoa();du.xuatdt();
   }//if
  getchar();
  break;
     case '7':  cout<<"\n";
  cout<<"Da thuc 1 sau khi doi dau: ";
  -a;a.chuanhoa();a.xuatdt();
  cout<<"Da thuc 2 sau khi doi dau: ";
  -b;b.chuanhoa();b.xuatdt();
  getchar();
  break;
     case '8': clrscr();
  break;
     case '9':  exit=1;
  break;
     default : ;
     }
  }

}