questions with answer in C programming language

1)

struct aaa

{

struct aaa *prev;

int i;

struct aaa *next;

};

main()

{

 struct aaa abc,def,ghi,jkl;

 int x=100;

 abc.i=0;abc.prev=&jkl;

 abc.next=&def;

 def.i=1;def.prev=&abc;def.next=&ghi;

 ghi.i=2;ghi.prev=&def;

 ghi.next=&jkl;

 jkl.i=3;jkl.prev=&ghi;jkl.next=&abc;

 x=abc.next->next->prev->next->i;

 printf("%d",x);

}

Answer:

2

Explanation:

above all statements form a double circular linked list;

abc.next->next->prev->next->i 

this one points to "ghi" node the value of at particular node is 2.

2)

struct point

 {

 int x;

 int y;

 };

struct point origin,*pp;

main()

{

pp=&origin;

printf("origin is(%d%d)\n",(*pp).x,(*pp).y);

printf("origin is (%d%d)\n",pp->x,pp->y);

} 

Answer:

origin is(0,0)

origin is(0,0) 

Explanation:

pp is a pointer to structure. we can access the elements of the structure either with arrow mark or with indirection operator. 

Note: 

Since structure point  is globally declared x & y are initialized as zeroes 

3)

main()

{

 int i=_l_abc(10);

  printf("%d\n",--i);

}

int _l_abc(int i)

{

 return(i++);

}

Answer:

9

Explanation: 

return(i++) it will first return i and then increments. i.e. 10 will be returned.

4)

main()

{

 char *p;

 int *q;

 long *r;

 p=q=r=0;

 p++;

 q++;

 r++;

 printf("%p...%p...%p",p,q,r);

}

Answer:

0001...0002...0004

Explanation:

++ operator  when applied to pointers increments address according to their corresponding data-types.

 5)

main()

{

 char c=' ',x,convert(z);

 getc(c);

 if((c>='a') && (c<='z'))

 x=convert(c);

 printf("%c",x);

}

convert(z)

{

  return z-32;

}

Answer: 

Compiler error

Explanation:

declaration of convert and format of getc() are wrong. 

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