C++ class program to perform rational number arithmetic Operations using Operator Overloading

#include<stdio.h>          

 #include<iostream.h>

 #include<conio.h>

 class rational

 {

                 int numer;

                 int denom;

                 public:

                 void getdata()

                 {

                                 cout<<"\n enter the numerator part of the rational no.";

                                 cin>>numer;

                                 cout<<"\n enter the denominator part of the rational no.";

                                 cin>>denom;

                 }

                 void operator+(rational);

                 void operator-(rational);

                 void operator *(rational);

                 void operator /(rational);

 };

 void rational ::operator+(rational c1)

 {

                 rational temp;

                 temp.numer=(numer*c1.denom)+(c1.numer*denom);

                 temp.denom=denom*c1.denom;

                 cout<<"\nrational no. after addition";

                 cout<<"\n numerator="<<temp.numer<<"\n denominator ="<<temp.denom;

 }

 void raional ::operator -(rational c1)

 {

                 rational temp;

                 temp.numer=(numer*c1.denom)-(c1.numer*denom);

                 temp.denom=denom*c1.denom;

                 cout<<"\n rational no. after subtraction";

                 cout<<"\n numerator="<<temp.numer<,"\n denominator ="<<temp.denom;

 }

 void rational ::operator (rational c1)

 {

                 rational temp;

                 temp.numer=numer*c1.numer;

                 temp.denom=denom*c1.denom;

                 cout<<"\n rational no. after multiplication";

                 cout <<"\n numerator="<temp.numer<<"\n denominator ="<< temp.denom;

 }

 void rational :: operator /(rational c1)

 {

                 rational temp;

                 temp.numer= numer*c1.denom;

                 temp.denom=c1.numer*denom;

                 cout<<"\n rational no. after division";

                 cout <<"\n numerator="<<temp.numer<<"\n denominator ="<<temp.denom;

 }

 void main()

 {

                 clrscr();

                 rational c1, c2;

                 int n;

                 do

                 {

                                 cout<<"\n 1.Input data for rational no. ";

                                 cout<<"\n 2. Addition of rational no. ";

                                 cout<<"\n 3. Subtraction of rational no. ";

                                 cout<<"\n 4. Multiplication of rational no.";

                                 cout<<\n  5. Division of rational no. ";

                                 cout<<"\n 6. Quit";

                                 cout<<"\n Enter your choice";

                                 cin>>n;

                                 switch(n)

                                 {

                                                 case 1:

                                                 cout<<endl<<"\n enter the data for first rational no.";

                                                 c1.getdata();

                                                 cout<<endl<<"\n enter the data for second rational no. ";

                                                 c2.getdata ();

                                                 clrscr();

                                                 break;

                                                 case 2;

                                                 c1+c2;

                                                 getch();

                                                 clrscr();

                                                 break;

                                                 case 3;

                                                 c1-c2;

                                                 getch();

                                                 clrscr();

                                                 case 4:

                                                 c1*c2;

                                                 getch();

                                                 clrscr();

                                                 break;

                                                 case 5:

                                                 c1/c2;

                                                 getch();

                                                 clrscr();

                                                 break;

                                                 case 6:

                                                 exit(1);

                                                 break;

                                 }

                 } while (n!=6);

                 getch();

 }

Operator Overloading in C++ to add,substract,multiply and divide two Complex Numbers

Operator Overloading is a technique of polymorphism by which an operator(+,- etc) can be used to do different types of operations. eg:+ can be used to add two integers say a and b using sum=a+b similarly two floating point numbers say fa,fb by fs=fa+fb. In this example +,-,*,- operators are overloaded to add,subtract, multiply and divide two complex numbers. 

#include<iostream.h> 

 #include<conio.h> 

 class complex 

 { 

 int a,b; 

 public: 

 void read() 

 { 

 cout<<"\n\nEnter the REAL PART : "; 

 cin>>a; 

 cout<<"\n\nEnter the IMAGINARY PART : "; 

 cin>>b; 

 } 

 complex operator +(complex c2) 

 { 

 complex c3; 

 c3.a=a+c2.a; 

 c3.b=b+c2.b; 

 return c3; 

 } 

 complex operator -(complex c2) 

 { 

 complex c3; 

 c3.a=a-c2.a; 

 c3.b=b-c2.b; 

 return c3; 

 } 

 complex operator *(complex c2) 

 { 

 complex c3; 

 c3.a=(a*c2.a)-(b*c2.b); 

 c3.b=(b*c2.a)+(a*c2.b); 

 return c3; 

 } 

 complex operator /(complex c2) 

 { 

 complex c3; 

 c3.a=((a*c2.a)+(b*c2.b))/((c2.a*c2.a)+(c2.b*c2.b)); 

 c3.b=((b*c2.a)-(a*c2.b))/((c2.a*c2.a)+(c2.b*c2.b)); 

 return c3; 

 } 

 void display() 

 { 

 cout<<a<<"+"<<b<<"i"; 

 } 

 }; 

 void main() 

 { 

 complex c1,c2,c3; 

 int choice,cont; 

 do 

 { 

 clrscr(); 

 cout<<"\t\tCOMPLEX NUMBERS\n\n1.ADDITION\n\n2.SUBTRACTION\n\n3.MULTIPLICATION\n\n4.DIVISION"; 

 cout<<"\n\nEnter your choice : "; 

 cin>>choice; 

 if(choice==1||choice==2||choice==3||choice==4) 

 { 

 cout<<"\n\nEnter the First Complex Number"; 

 c1.read(); 

 cout<<"\n\nEnter the Second Complex Number"; 

 c2.read(); 

 } 

 switch(choice) 

 { 

 case 1     : c3=c1+c2; 

            cout<<"\n\nSUM = "; 

            c3.display(); 

            break; 

 case 2     : c3=c1-c2; 

            cout<<"\n\nResult = "; 

            c3.display(); 

            break; 

 case 3 : c3=c1*c2; 

            cout<<"\n\nPRODUCT = "; 

            c3.display(); 

            break; 

 case 4     : c3=c1/c2; 

            cout<<"\n\nQOUTIENT = "; 

            c3.display(); 

            break; 

 default     : cout<<"\n\nUndefined Choice"; 

 } 

 cout<<"\n\nDo You Want to Continue?(1-Y,0-N)"; 

 cin>>cont; 

 }while(cont==1); 

 getch(); 

 }