int show(T4Tutorials_SERIES n) as a friend in a class T4Tutorials_SERIES; then this function show() can access the private and protected members of the class T4Tutorials_SERIES. You must know that a global function can also be declared as a friend function of the class.
Syntax of friend function in C++
class class_name_T4Tutorials { … friend return_type function_name(arguments); … }
C++ Program to show the Sum of the series Using friend function
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#include <iostream> using namespace std; class T4Tutorials_SERIES { private: int n; int k=9; int sum=0; public: T4Tutorials_SERIES() { cout<<"Please enter a number: "; cin>>n; for(int i=1;i<=n;i++) { sum=sum+k; k=k*10+9; } } friend int show(T4Tutorials_SERIES); }; int show(T4Tutorials_SERIES n) { cout<<"Hi, the sum of T4Tutorials_SERIES is: "<<n.sum; } int main() { T4Tutorials_SERIES n; show(n); } |