uninstall nginx
sudo apt-get purge nginx nginx-commonuninstall nginx
sudo apt-get purge nginx nginx-commonfriend class and friend function
class A{
private:
int data_a;
public:
A(int x){
data_a=x;
}
friend int fun(A, B);
}
class B{
private:
int data_b;
public:
A(int x){
data_b=x;
}
friend int fun(A, B);
}
int fun(A a, B b){
return a.data_a+b.data_b;
}
int main(){
A a(10);
B b(20);
cout<<fun(a,b)<<endl;
return 0;
}Copyright © 2021 Codeinu
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