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Question

What is the output of this program? 
    #include <iostream>
    #include <stack>
    using namespace std;
    int main ()
    {
        stack<int> mystack;
        mystack.push(10);
        mystack.push(20);
        mystack.top() -= 5;
        cout << mystack.top() << endl;
        return 0;
    }

a.

10

b.

20

c.

13

d.

15

Posted under Object Oriented Programming Using C++

Answer: (d).15

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