How to access a private variable which is within a function [closed] - c++

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#include <iostream>
using namespace std;
class Test{
public:
int kk(int b){
return a=b+5;
}
private:
int a;
/*void priv()
{
int a; // How to access a , if this part was not commented
}*/
};
int main()
{
Test kris;
cout<< kris.kk(5)<<endl;
return 0;
}
I was trying to understand the concept of private and public members and the methods to access the private members when they are defined in a class. I wanted to rephrase the question to how to access a variable, which is local to a private function via an object of class "Test" (as defined in the code).
I found the answer to it and experimented it with my own code and i was able to execute the code. Below is the code
#include <iostream>
using namespace std;
class Test{
public:
int xyz_1(){
return xyz_2() ;
}
private:
int xyz_2(){
int a=5;
return a;
}
};
int main()
{
Test kris;
cout<< kris.xyz_1()<<endl<<"Sorry for the confusion"<<endl;
return 0;
}

Answer 1

How to access a private variable which is within a function
You're trying to access a local variable of priv() in the function kk() which is impossible unless the visibility of the variable a is either public or outside the function (in case with classes) under private: (which will make it accessible to all member functions). In a rough way, you're trying to do something:
void fun1() {
int a;
}
void fun2() {
std::cout << a;
}
Which is not possible.

Answer 2

You might need to think more about your design and what you achieve.
Do you want to have a private member in the class to access the function? Then declare your variable "a" as a private member in your class, and use this.a inside your function. If you want a child class to be also able to access your private member, make the variable protected instead of private.
If you want to restrict any other function in your class from accessing that member, then I would be curious about what your intention is. If you try to hide the implementation you might want to look into the Pimpl technique. However, it also has a very specific use case (besides that you can use it to hide the implementation from developers, too).
https://en.cppreference.com/w/cpp/language/pimpl[pimpl programming technique]1
If you add more information about your problem and intention I'm sure people can give you better directions.