/* Phan so thuc hien cac phep tinh cong, tru, nhan, chia*/

#include<stdio.h>
#include<conio.h>
#define MAX 10

typedef struct Phanso
    {
     int Tuso;
     int Mauso;
    }phanso;
phanso ps[MAX];

int i;
//-------- Khai bao prototype ---------
void Nhap(int n); //Ham nhap n phan so
int UCLN(int a, int b);//Ham tim UCLN cua 2 so
void Rutgon(phanso *s); //Ham rut gon 2 phan so
void Inra(phanso s); //In phan so
phanso Cong2ps(phanso x,phanso y);//Ham tinh tong 2 phan so
phanso Tru2ps(phanso x,phanso y);//Ham tinh hieu 2 phan so
void Cong_Tru(int n);//Ham tinh tong, hieu n phan so
phanso Nhan2ps(phanso x,phanso y);//Ham tinh tich 2 phan so
void Nhan_Chia(int n); //Ham tinh tich, thuong n phan so

//-------- NHAP n PHAN SO --------
void Nhap(int n)
{
  for(i=0;i<n;i++)
    {
     printf("Phan So Thu %d:\n",i+1);
     printf("\tNhap vao Tu So:");  scanf("%d",&ps[i].Tuso);
     do{
        printf("\tNhap vao Mau So:"); scanf("%d",&ps[i].Mauso);
        if(ps[i].Mauso == 0)
        printf("Mau So phai khac 0!!!"); 
       }while(ps[i].Mauso == 0);
     Rutgon(&ps[i]);
    }
}
//-------- TIM UCLN CUA 2 SO -----
int UCLN(int a,int b)
{
 while(a!=b) a>b?(a=a-b):(b=b-a);
 return a;
}

//-------- RUT GON 1 PHAN SO -----
void Rutgon(phanso *s)
{
 int temp=UCLN(s->Tuso,s->Mauso);
 s->Tuso/=temp;
 s->Mauso/=temp;
}

//--------- CONG 2 PHAN SO -------
phanso Cong2ps(phanso x,phanso y)
{
 phanso s;
 s.Tuso=((x.Tuso*y.Mauso)+(y.Tuso*x.Mauso));
 s.Mauso=(x.Mauso*y.Mauso);
 Rutgon(&s);
 return s;
}

//--------- TRU 2 PHAN SO -------
phanso Tru2ps(phanso x,phanso y)
{
 phanso s;
 s.Tuso=((x.Tuso*y.Mauso)-(y.Tuso*x.Mauso));
 s.Mauso=(x.Mauso*y.Mauso);
 Rutgon(&s);
 return s;
}

//--------- CONG TRU n PHAN SO -------
void Cong_Tru(int n)
{
 phanso sum=ps[0],sub=ps[0];
 for(i=1;i<n;i++)
    {
     sum=Cong2ps(sum,ps[i]);
     sub=Tru2ps(sub,ps[i]);
    }
 Rutgon(&sum);
 printf ("\nTong cac phan so vua nhap =");
 Inra(sum);
 Rutgon(&sub);
 printf ("\nHieu cac phan so vua nhap =");
 Inra(sub);
}

//--------- NHAN 2 PHAN SO -------
phanso Tich2ps(phanso x,phanso y)
{
 phanso s;
 s.Tuso=(x.Tuso*y.Tuso);
 s.Mauso=(x.Mauso*y.Mauso);
 Rutgon(&s);
 return s;
}

//--------- NHAN CHIA n PHAN SO -------
void Nhan_Chia(int n)
{
 phanso temp,tich=ps[0],thuong=ps[0];
 for(i=1;i<n;i++)
    {
     tich=Tich2ps(tich,ps[i]);
     temp=ps[i];
         {
         temp.Tuso=temp.Tuso+temp.Mauso;
         temp.Mauso=temp.Tuso-temp.Mauso;
         temp.Tuso=temp.Tuso-temp.Mauso;
        }
     thuong=Tich2ps(thuong,temp);     
    }
 Rutgon(&tich);
 printf ("\nTich cac phan so vua nhap =");
 Inra(tich);
 Rutgon(&thuong);
 printf ("\nThuong cac phan so vua nhap =");
 Inra(thuong);
}

//---------- IN PHAN SO ---------
void Inra(phanso s)
{
 if(s.Tuso==s.Mauso||s.Mauso==1)
    printf (" %d",s.Tuso);
 else
    printf (" %d/%d",s.Tuso,s.Mauso);
}

void menu(void)
{
  printf("\n*******************************************************");
  printf("\n*  CHAO MUNG DEN VOI CHUONG TRINH TINH PHAN SO        *");
  printf("\n*  1. Nhap                                            *");
  printf("\n*  2. Tinh tong va hieu                               *");
  printf("\n*  3. Tinh tich va thuong                             *");  
  printf("\n*  0. Thoat                                           *");
  printf("\n*******************************************************");
  printf("\nChon lua ? ");
}

//----------HAM MAIN---------------
void main()
{
 int n,tiep=0;
 char traloi;
 clrscr();
 do {
    menu();
    do {
     traloi = getch();
     fflush(stdin);
       } while (traloi < '0' || traloi > '3');    
    switch (traloi)
    {
    case '1' : //clrscr();
            printf("Co bao nhieu phan so can nhap:"); scanf("%d",&n);
            Nhap(n);
           fflush(stdin);
           tiep++;
          break;
    case '2' : //clrscr();
           if(tiep==0)
            {
             printf("Khong co phan so nao ca !!!");
               break;
            }
           else 
             Cong_Tru(n); 
          break;
    case '3' : //clrscr();
           if(tiep==0)
            {
             printf("Khong co phan so nao ca !!!");
               break;
            }
           else  
              Nhan_Chia(n);
          break;
    }
  } while (traloi != '0');
 getch();
}  

__________________
//phanso sum=ps[0],sub=ps[0]; // Khong the gan nhu vay duoc
//phanso sum = { ps[0].Tuso, ps[0].Mauso };