Class 18: Assorted Topics

Question 1

What holds for any data type <DT>

Answer 1

If you use the & operator on a variable of data type <DT> then the data type of the result is <DT>+ *

Question 2

What happens is you use * operator on a variable of data type <DT>

Answer 2

The data type of results is <DT>-*

Question 3

Int a; <DT> = int
&a. <DT> +*
Can a be dereferenced?

Answer 3

No because data type does not contain *

Question 4

Int *a <DT> = int *
&a. <DT> + *
a. <DT> -

Answer 4

Example problem

Question 5

Little median

Answer 5

Least significant byte is stored first in memory

Question 6

Consider the structure

Struct prob{
Int k;
Int j;
Int a[2];
Int *p;
};

What is the size of this struct?

Answer 6

Two 4-byte values (int)
A two-element array of type in
8 byte integer pointer for a total of 24 bytes

Question 7

Union

Answer 7

All field reference same block of memory rather than different blocks

Question 8

Size of this union

Union {
Int b;
Char y[4];
}

Answer 8

Size of union is 4 bytes

Question 9

How do we get size of union

Answer 9

The size of union is taken according to the size of the largest member in union

Question 10

Big Endian

Answer 10

Most significant byte is stored first in memory