Answer / d.v.rama krishna

While Creating the user interface all the functions should
be public, and all the fuctions are pure virtual functions.

Here is the example code

#define interface struct

interface <inter face name >
{
virtual int add(int x, int y) =0;
};

class A : public <<inter face name>>
{
public:
.
.

int add (int x, int y);
};

int A:: add(int x, int y)
{
return x+y;
}

difference between assert and verify.

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#include<stdio.h>int(){int a,*b,**c,***d,****e; a=10;b=&a;c=&b;d=&c;e=&c;printf("a=%d b=%u c=%u d=% e=%u",a,b,c,d,e);printf ("%d%d%d\n",a,a+?*b,**c+***d+,****e);return0;}

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