Addition and Subtraction using class

#include <iostream>

using namespace std;

class calculation{
    public:
    int num1,num2,result;

    void takeInput(){
        cout<< "Enter num1 :";
        cin>> num1;
        cout<< "Enter num2 :";
        cin>> num2;
    }


    int sum(){
        takeInput();
        result = num1+num2;
        return result;
    }

    int sub(){
        result = num1-num2;
        return result;
    }
};

int main()
{
    calculation object;
    int sub,sum;
    sum = object.sum();
    sub = object.sub();

    cout<< "Sum of "<< object.num1<< " and "<< object.num2<< " is "<< sum<< endl;
    cout<< "Subtraction of "<< object.num1<< " and "<< object.num2<< " is "<< sub;
    return 0;
}