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tính tổng- hiệu- tích- thương 2 phân số:
code:


#include<iostream.h>
#include<iomanip.h>
#include<conio.h>
#include<math.h>
int uc(int a,int b)
 {
  if (a*b==0)
 return 1;
  else
  {
 while (a!=b)
 {
  if (a>b)
a=a-b;
  else
b=b-a;
 }
 return a;
  }
 }
class PS
{
 private:
  int t;
  int m;
  public:
 PS()
 {
  t=0;
  m=1;
 }
 friend ostream& operator<< (ostream& os,PS x)
 {
  os<< x.t << "/" << x.m;
  return os;
 }

 friend istream& operator>> (istream& is,PS &x)
 {
  cout<< "Nhap tu : ";
  is>> x.t;
  cout<<"nhap mau : ";
  is>>x.m;
  return is;
 }
 PS operator+(PS b)
 {
  PS c;
  c.t=t*b.m+m*b.t;
  c.m=m*b.m;
  return tg(c);
 }
 PS operator-(PS b)
 {
  PS c;
  c.t = t*b.m-m*b.t;
  c.m = m*b.m;
  return tg(c);
 }
PS operator*(PS b)
 {
  PS c;
  c.t = t*b.t;
  c.m=m*b.m;
  return tg(c);
 }
PS operator/(PS b)
 {
  PS c;
  c.t=t*b.m;
  c.m = m*b.t;
  return tg(c);
 }
PS tg(PS x)
 {
  int s = uc(x.t,x.m);
  x.t=x.t/s;
  x.m=x.m/s;
  return x;
 }
 };
void main()
 {
  clrscr();
  PS a,b,c,d,e,f;
  cin>>a;
  cin>>b;
  c=a+b;
  d=a-b;
  e=a*b;
  f=a/b;
  cout<<"Tong : "<<c<<"\n";
  cout<<"Hieu : "<<d<<"\n";
  cout<<"Tich : "<<e<<"\n";
  cout<<"Thuong : "<<f<<"\n";
  getch();
 }

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