New to c++, need tips for OOP - c++

Question

I just want to say that this is my first time trying to learn a programming language so excuse my indifference. I am trying to get used to object oriented programming. The problem is I can't figure out how to get what the user inputted without storing it in a public variable.
#include <iostream>
using namespace std;
class Aclass{
public:
void setx(int a){
x = a;
}
void sety(int b){
y = b;
}
void setsum(int c){
c = sum;
}
int getx(){
return x;
}
int gety(){
return y;
}
int getsum(){
return sum;
}
private:
int x;
int y;
int sum;
int diff;
int mult;
int div;
};
int main()
{
string NB;
cout << "What you like to do ?(Sum, Difference, Multiplication or Division)\n";
cin >> NB;
if(NB == "Sum") {
Aclass Ab;
cout << "Enter Your First Number\n";
Ab.setx(cin >> a);
return 0;
}
}

Answer 1

You need to store the user input in a variable, then pass it to Ab.setx to store the variable in the object, i.e.
int main() {
// Declare your variables
Aclass Ab;
string choice;
int x, y;
// Get user choice
cout << "What you like to do? (Sum, Diff, Mul or Div)" << endl;
cin >> choice;
// Get user inputs
if (choice == "Sum") {
cout << "Enter your first number" << endl;
cin >> x; // Get the user input from 'cin' and store it in 'a'
cout << "Enter your second number" << endl;
cin >> y;
// Pass x, y to the Ab object and store them there
Ab.setx(x);
Ab.sety(y);
cout << "The final sum is: " << Ab.getsum() << endl;
}
return 0;
}
Note: the above code requires an implement of getsum as follows:
class Aclass{
// ...
public:
int getsum(){
return (this->x + this->y);
}
// ...