Knowledge Check - Type System
1. True/False. The int
type can store any possible integer.
False. It has a range (roughly -2 billion to +2 billion). It cannot store numbers beyond that range.
2. Order the following by how large of numbers they can hold, from smallest to largest: short
, long
, int
, byte
.
byte
, short
, int
, long
. A byte
is 1 byte and its largest value is 255. A short
is 2 bytes and its largest value
is approximately 32 thousand. An int
is 4 bytes and its largest value is approximately +2 billion. A long
is 8 bytes,
and its largest value is approximately 9 quintillion.
3. True/False. The byte
type is signed.
False. A signed type is one that includes a positive or negative sign. A byte is the range 0 to 255, and does not allow for negative values. Thus, it is unsigned.
4. Which can store higher numbers, int
or uint
?
uint
. Both are 4 bytes in size, but int
’s range is about -2 billion to +2 billion, while uint
is 0 to about 4 billion.
That makes uint
capable of storing larger numbers, but int
capable of storing negative numbers that uint
cannot store.
5. What three types can store floating-point numbers?
The three floating-point types are float
, double
, and decimal
. These store numbers that can include a decimal
point.
6. Which of the options in question 5 can hold the largest numbers?
double
holds the biggest numbers, though decimal
uses more bytes and can represent more precise numbers, even
though its range isn’t as large.
7. Which of the options in question 5 is considered the most precise?
decimal
is the most precise of the three, though double
can store larger numbers.
8. What type does the literal value "8"
have?
A literal "8"
has a type of string
. Even though it looks like a digit, it is textual because it is in quotes.
And because it is double-quotes instead of single quotes, it is a string
literal.
9. What type stores true or false values?
The bool
type is for storing values of true
and false
.