Recent Placement Papers of Cisco

Which of the following involves context switch,

A thread is

#include <stdio.h>
void main()
      {
       unsigned short a=-1;
       unsigned char b=a;
       printf("%d %d ",a,b);
      }
What is output of the program?

int a[5][6]

main()
{
int a;
printf("%d",scanf(%d,&a));
}

Find the output for the following C program

#define d 10+10
main()
{
printf("%d",d*d);
}

Given the following statement
enum day = { jan = 1 ,feb=4, april, may}
What is the value of may?

Given arrays base address is 1000. array is a[5][4]. Then what is the correct address of a[4][3].

The concatenation of 2 lists can be performed O(1) time. Which of the following implementation of list should be used?

For linked list implementation , which search is not applicable ?