Answer Posted / harry0009

#include<iostream.h>
class sample
{
int a,b;
public:
void setvalue()
{
a = 25;
b = 45;
}
friend float mean(sample s);
};
float mean(sample s)
{
return(float(s.a+& b)/20);
}
void main()
{
sample ;
x.setvalue
cout<<"mean value"<<mean(x);
getch();
}

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