Reload stream insertion operators and stream extraction Operators

The reload Function Format for "<" and ">" is as follows:

Istream & operator> (istream &, custom Class &);

Ostream & operator <(ostream &, custom Class &);

You can only use the ">" and "<" functions as friend functions or common functions, rather than defining them as member functions.

 1 # Include <iostream. h>
 2  
 3   //  Using namespace STD;  
  4    
5   Class Complex
 6 {
 7   Public :
 8 Friend ostream & Operator <(Ostream &, complex &);
 9 Friend istream & Operator >>( Istream &, complex &);
 10   Private :
11       Double Real;
 12       Double Imag;
 13 };
 14  
 15 Ostream & Operator <(Ostream & output, complex & C)
 16 {
 17 Output < "  ( " <C. Real;
 18       If (C. imag> = 0 ) Output < "  +  " ;
 19 Output <C. imag < "  I)  " <Endl;
 20       Return Output;
21 }
 22  
 23 Istream & Operator > (Istream & input, complex & C)
 24 {
 25 Cout < "  Please input real part and imaginary part of Complex Number:  " ;
 26 Input> C. Real> C. imag;
 27      Return Input;
 28 }
 29  
 30   Int Main ( Void )
 31 {
 32 Complex C1, C2;
 33 Cin> C1> C2;
 34 Cout < "  C1 = " <C1 <Endl;
 35 Cout < "  C2 =  " <C2 <Endl;
 36       Return   0 ;
 37 }

 

The compilation system interprets "cout <C":

Operator <(cout, c)

Call the following operator by using cout and C as real parameters <Function

Ostream & operator <(ostream & output, complex & C)