Created 07/09/03; edited 06/20/2015

Quiz on Linked Lists

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1. Here is a description of one node of a linked list (using the language C): 

struct size
{
  int width;
  int height;
  struct size *next;  // this means a pointer to
                      // the next node.
} ;

This describes a node that consists of two integers followed by an address.

Which of the following code fragments dynamically allocates enough memory for the node and puts its address in $s0 ?

A.    
li      $v0,9
li      $a0,12
syscall
move    $s1,$v0
B.    
li      $v0,12
li      $a0,8
syscall
move    $s1,$v0
C.    
li      $v0,12
li      $a0,8
syscall
move    $v0,$s1
D.    
li      $v0,12
li      $a0,8
syscall
move    $a0,$s1

2. Here (again) is a description of one node of a linked list: 

struct size
{
  int width;
  int height;
  struct size *next;  // this means a pointer to
                      // the next node.
} ;

Assume that the address of a node is in $v0. Which of the following puts a width of 12 and a height of 17 into the node?

A.    
li    $t0,17
sw    $t0,0($v0)
li    $t0,12
sw    $t0,4($v0)
B.    
li    $t0,12
sw    $t0,4($v0)
li    $t0,17
sw    $t0,0($v0)
C.    
li    $t0,12
sw    $t0,0($v0)
li    $t0,17
sw    $t0,4($v0)
D.    
li    $t0,12
sw    $v0,0($t0)
li    $t0,17
sw    $v0,4($t0)

3. Here is a description of one node of a linked list: 

struct size
{
  int width;
  int height;
  struct size *next;  // this means a pointer to
                      // the next node.
} ;

Assume that $s1 points at node 1 and that $s2 points at node 2. Which of the following makes node 2 the successor of node 1?

A.    sw $s2,4($s1)
B.    sw $s2,8($s1)
C.    sw $s1,0($s2)
D.    sw $s1,4($s2)

4. Here is a description of one node of a linked list: 

struct size
{
  int width;
  int height;
  struct size *next;  // this means a pointer to
                      // the next node.
} ;

The field head contains the address of a linked list of such nodes. Which of the following segments visits each node of the list?

A.    
        lw     $s0,done
loop:   beqz   $s0,head
        . . .              # do something
        lw     $s0,4($s0)
        b      loop
        
done:
B.    
        lw     $s0,head
loop:   beqz   $s0,done
        . . .              # do something
        lw     $s0,$s0
        b      loop        
done:
C.    
        lw     $s0,head
loop:   beqz   $s0,done
        . . .              # do something
        lw     $s0,8($s0)
        b      loop        
done:
D.    
        lw     $s0,head
loop:   beqz   $s0,done
        . . .              # do something
        sw     $s0,4($s0)
        b      loop        
done:

5. Here is a description of one node of a linked list: 

struct size
{
  int width;
  int height;
  struct size *next;  // this means a pointer to
                      // the next node.
} ;

Assume that $s0 is pointing to the last node of a linked list. Which of the following code segments attaches one more node to the list and points $s0 to it?

A.    
       li      $v0,9
       li      $a0,12
       syscall
       sw      $v0,8($s0)
       move    $s0,$v0
B.    
       li      $v0,9
       li      $a0,12
       syscall
       sw      $v0,8($v0)
       move    $s0,$v0
C.    
       li      $v0,9
       li      $a0,8
       syscall
       sw      $v0,4($v0)
       move    $s0,$v0
D.    
       li      $v0,12
       li      $a0,8
       syscall
       sw      $v0,8($v0)
       move    $s0,$v0

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