Write a program using friend function

Class sample
          private: int a, b;
          public:void setvalue()
         { 
                   a=20; b=40; 
          }
          friend void mean (sample s);
};
void mean (sample s)
        int c= (s.a+s.b)/2.0;
        cout<<c; 
}
main()
{
sample x;
x.setvalue();
mean(x);
}

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