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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class Number
  5. {
  6.     int num;
  7.     public:
  8.     Number()
  9.     {
  10.         cout<<"Enter number: ";
  11.         cin>>num;
  12.     }
  13.     void display()
  14.     {
  15.         cout<<num<<' ';
  16.     }
  17.     friend void Swap(Number&, Number&);
  18. };
  19.  
  20. void Swap(Number& obj1,Number& obj2)
  21. {
  22.     int temp=obj1.num;
  23.     obj1.num=obj2.num;
  24.     obj2.num=temp;
  25. }
  26.  
  27. int main()
  28. {
  29.     Number obj1,obj2;
  30.     cout<<"\nBefore swap :";
  31.     obj1.display();
  32.     obj2.display();
  33.  
  34.     Swap(obj1,obj2);
  35.     cout<<"\nAfter swap :";
  36.     obj1.display();
  37.     obj2.display();
  38.  
  39.     return 0;
  40. }
  41.  
Success #stdin #stdout 0.01s 5284KB
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stdin
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Standard input is empty
stdout
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Enter number: Enter number: 
Before swap :-246106688 32766 
After swap :32766 -246106688
https://ideone.com/CoSoXH
02.swap two num from diff class using friend function
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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