#include"stdio.h"

#include"conio.h"

#include"iostream.h"

#include"math.h"

#include"iomanip.h"

class phanso

    {

            private:

                    int ts,ms;

                public:

                        friend void doc(char *tentep,phanso &a,phanso &b);

                        friend void ghi(char *tentep);

                        void nhap();

                        void xuat();

                        friend void rutgon(phanso &a);

                        friend phanso tongps(phanso a,phanso b);

                        friend phanso hieups(phanso a,phanso b);

                        friend phanso tichps(phanso a,phanso b);

                };

void phanso::nhap()

    {

            cout<<"

Nhap tu so:"; cin>>ts;

                cout<<"

Nhap mau so:"; cin>>ms;

                }

void doc(char *tentep,phanso &a,phanso &b)

    {

            FILE *f;

                f=fopen(tentep,"rb");

                fread(&a,sizeof(phanso),1,f);

            fread(&b,sizeof(phanso),1,f);

                fclose(f);

                }

void taofile(char *tentep)

    {

            FILE *f;

                phanso tg;

                f=fopen(tentep,"wb");

                cout<<"

Nhap phan so thu nhat:";

                tg.nhap();

                fwrite(&tg,sizeof(phanso),1,f);

                cout<<"

Nhap phan so thu hai:";

                tg.nhap();

                fwrite(&tg,sizeof(phanso),1,f);

                fclose(f);

        }

/*void ghi(char *tentep)

    {

            FILE *f;

                f=fopen(tentep,"wb");

                fflush(f);

                putw(ts,f);

                putw(ms,f);

                fclose(f);

                }*/

void phanso::xuat()

    {

            cout<<ts<<"/"<<ms;

                }

void xuatfile(char *tentep)

    {

            FILE *f;

                phanso tg;

                f=fopen(tentep,"rb");

                fread(&tg,sizeof(phanso),1,f);

                   cout<<"

Phan so thu nhat la:";

                tg.xuat();

                fread(&tg,sizeof(phanso),1,f);

        cout<<"

Phan so thu hai la:";

                tg.xuat();

                fclose(f);

                }

int ucln(int x,int y)

    {

            while (x!=y)

                if(x>y)

                    x=x-y;

                else

                    y=y-x;

                        return(x);

                        }

void rutgon(phanso &a)

    {

            int uc;

                uc=ucln(abs(a.ts),abs(a.ms));

                a.ts=a.ts/uc;

                a.ms=a.ms/uc;

                }

phanso tongps(phanso a,phanso b)

    {

            phanso tong;

                tong.ts=a.ts*b.ms+b.ts*a.ms;

                tong.ms=a.ms*b.ms;

                rutgon(tong);

                return(tong);

                }

phanso hieups(phanso a,phanso b)

    {

            phanso hieu;

                hieu.ts=a.ts*b.ms-b.ts*a.ms;

                hieu.ms=a.ms*b.ms;

                rutgon(hieu);

                return(hieu);

                }

phanso tichps(phanso a,phanso b)

    {

            phanso tich;

                tich.ts=a.ts*b.ts;

                tich.ms=a.ms*b.ms;

                rutgon(tich);

                return(tich);

                }

void main()

    {       char *tentep1;

            phanso a,b,ps;

                clrscr();

                cout<<"

Nhap ten file:"; gets(tentep1);

                taofile(tentep1);

                cout<<"

Du lieu trong file la";

                xuatfile(tentep1);

                cout<<"

";

                doc(tentep1,a,b);

                cout<<"

a="; a.xuat();

                cout<<"

b="; b.xuat();

                cout<<"

Tinh toan cho 2 phan so:

";

                cout<<"

a + b =";

                ps=tongps(a,b);

            ps.xuat();

                cout<<"

a - b =";

        ps=hieups(a,b);

                ps.xuat();

                cout<<"

a x b =";

            ps=tichps(a,b);

                ps.xuat();

                /*cout<<"

Xuat phan so tu File ra man hinh:

";

                cout<<"

Phan so a la:";

                a.ghi(tentep1);

                xuatfile(tentep1,'a');

                cout<<"

Phan so b la:";

                b.ghi(tentep2);

                xuatfile(tentep2,'b');*/

                getch();

        }