Why is this showing error

#1

#include
#include
using namespace std;
int main()
{ //stack works on LIFO
stack st;
//three basic functions are
//push , pop , .empty

st.push(10);
for(int i=0;i<6;i++)
{
    int a;
    cin>>a;
    st.push(a);
}
while(!st.empty())
{
    cout<<st.top()<<" ";//dispalys the top most element of stack
    st.pop();
}

}

#2

Check that you have included the header files.
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