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Technical - Other FIEM - 15 May 2007 by HP

Details of Technical - Other FIEM - 15 May 2007 by HP conducted by HP for job interview.
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HP PAPER ON 15th MAY 

hello everbody ...hope my questions will help

1.the paper was totally filled with c.
2.some programs were given and u are asked for the output.
3. give the o/p of the following programs>>>
a)main()
{ printf("%d",scanf("%d%d",printf,scanf));
}
1)2  2)2 2 3)0 4)error

b)there was a program of swaping by pointer(check it out)

c)main()
{char *p="quick";
char q[]="sort";
char *t;
  t=malloc(sizeof(p)+sizeof(q)+1);
  strcpy(t,p);
  strcat(t,p);
}

1)quick sort 2)sort sort 3)quickqick 4)sort quick

d)main()
{ int s[]={1,2,3,4,5,6};
 printf("%d",&a[0]-&a[5]);
}
1)error 2)8 3)6 4)0

e)try to know pointer and its various operation (say what will happen if 2 pointer is added or int pointer is addressed to a char etc.) 
4.try to know something about firewall and its functions