C++ LANGUAGE INPUT/OUTPUT OPERATORS OVERLOADING

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C++ LANGUAGE INPUT/OUTPUT OPERATORS OVERLOADING

Input/Output Operators Overloading 



C++ is able to input and output the built-in data types using 
the stream extraction operator >> and the stream 

extraction operators also can be overloaded to perform input 
insertion operator <<. The stream insertion and stream 
and output for user-defined types like an object. 


friend of the class because it would be called without creating an object.
Here, it is important to make operator overloading function a 
 
Following example explains how extraction operator >> 
and insertion operator <<. 



   public: 
#include <iostream> 
using namespace std; 
  
class Distance 
{ 
   private: 
      int feet;             // 0 to infinite 
      int inches;           // 0 to 12 

      friend ostream &operator<<( ostream &output,  
// required constructors 
      Distance(){ 
         feet = 0; 
         inches = 0; 
      } 
      Distance(int f, int i){ 
         feet = f; 
         inches = i; 
      } 

      } 
const Distance &D ) 
      {  
         output << "F : " << D.feet << " I : " << D.inches; 
         return output;             
 

   Distance D1(11, 10), D2(5, 11), D3; 
friend istream &operator>>( istream  &input, Distance &D ) 
      {  
         input >> D.feet >> D.inches; 
         return input;             
      } 
}; 
int main() 
{ 
 
   cout << "Enter the value of object : " << endl; 

When the above code is compiled and executed, it produces the following result: 
cin >> D3; 
   cout << "First Distance : " << D1 << endl; 
   cout << "Second Distance :" << D2 << endl; 
   cout << "Third Distance :" << D3 << endl; 
 
 
   return 0; 
} 
$./a.out 
Enter the value of object : 
70 
10 


First Distance : F : 11 I : 10 
Second Distance :F : 5 I : 11 

Third Distance :F : 70 I : 10