public abstract interface Frobnicate { public void twiddle(String s); } 

Which is a correct class?

How would you free the memory allocated by the following program?

#include "alloc.h"

#define MAXROW 3

#define MAXCOL 4

main()

{

     int **p, i;

     p = (int **) malloc (MAXROW * sizeof (int *));

      for ( i = 0; i < MAXROW ; i++)

            p[i] = (int *) malloc (MAXCOL * sizeof (int ));

}

How would you dynamically allocate a 2-D array of integers?

What would be the output of the following program ?

main()

{

     const int x = 5; 

      int *ptrx;

      ptrx = &x;

      *ptr = 10;

       printf ("%d", x);

}

Point out the error in the following program.

main()

{

    char mybuf[] = "Zanzibar" ;

    char yourbuf[] = " Zienckewiz";

    char * const ptr = mybuf;

     *ptr = 'a';

     ptr = yourbuf;

}

Improve the following code using typedef.

struct node

{

      int data1;  float data2;

       struct node *left;

       struct node *right;

};

struct node *ptr;

ptr = (struct node *) malloc (sizeof (struct node) ); 

In the following code can we declare a new typedef name emp even though struct employee has not been completely defined while using typedef? < Yes / No>

typedef struct employee *ptr;

struct employee

{

       char name[20];

        int age;

        ptr next;

};

Answer the following Program

#define CHARSIZE 8

#define MASK(y) (1 << y % CHARSIZE)

#define BITSLOT (y) (y / CHARSIZE)

#define SET(x,y) ( x[BITSLOT(y)] = MASK(y) )

#define TEST(x,y) ( x[BITSLOT(y)] & MASK(y) )

#define NUMSLOTS(n) ((n + CHARSIZE - 1) / CHARSIZE)

Give the above macros how would you

1. declare an array arr of 50 bits

2. put the 20th bit on

3. test whether the 40th bit is on or off

What would be the output of the following program ?

main() 

{

       unsigned  int a = oxffff;

        ~a;

        printf ("%x", a);

}