Length of Box using friend function in C++

Example Program:

Here is the simple program for printing the length of box using Friend Function in C++.

Source Code

using namespace std;
class Box
    int length;
    Box(): length(0) { }
    friend int printLength(Box);
int printLength(Box b)
  return b.length;
int main()
   Box b;
   cout<<"Length of box: "<< printLength(b)<<endl;
   return 0;
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Length of box: 10

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