#include <iostream>

using namespace std;

void Test(const int& i)//i is const here and hence can't be modified

{

   cout<<i<<endl;

}

void TestNew(int& i)

{

   cout<<i<<endl;

}

int* ReturnTest()

{

   static int i = 10;

    return &i;

}

const int* ReturnTest1()

{

    static int i=10;

    return &i;

}

int main()

{

    int a =10;

    Test(a); /* You can still pass non-const argument. It's absolutely ok. But, the vice-versa is not possible as shown in TestNew() method. You can't pass const agrument which to a  

                function which acceps a non-const parameter  */

    const int ci = 20;

 // TestNew(ci); /* This will give error */

    const int *pr = ReturnTest(); /* Still OK. vice versa is not ok as shown in ReturnTest1() */

//  int* r2 = ReturnTest1(); /* error */

       

}

 

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