Tokens in C

Question 1

What are the types of tokens in C?

Answer 1

CSIOKS:

Constants
String literal
Identifiers
Operators
Keywords
Separators

Question 2

Constants can also be called as?

Answer 2

Literals

Question 3

What are the types of constants?

Answer 3

Numeric constants

Character constants

Question 4

What are the types of a numeric constant?

Answer 4

1. Integers

2. Floating - point numbers

Question 5

What are the rules for defining a numeric constant?

Answer 5

No commas
No spaces between the unary sign (+ and -) and the digits
Must begin and end with a digit

Question 6

What is a character constant?

Answer 6

A single letter or number enclosed with single quotations

Question 7

Define the escape character:
'\n'
'\a'
'\b'
'\t'
'\0'
'\''
'\"'
%%

Answer 7

Newline
alert
backspace
tab
null
single quotes
double quotes
percent symbol

Question 8

What is a string literal?

Answer 8

A sentence or lines of texts enclosed with double quotations

Question 9

What are identifiers?

Answer 9

Descriptive names given to variables and constants

Question 10

What is a variable?

Answer 10

They store literals and can be changed during the execution of the program

Question 11

What are the rules on creating an identifier?

Answer 11

• It must consist of letters, numbers, and underscores
• Cannot begin with a digit
• An identifier defined in the C library is invalid
• They are case sensitive

Question 12

What are operators?

Answer 12

Math symbols in C

Question 13

Operators follow a hierarchy like pemdas. Label the arithmetic expressions from highest to lowest and evaluate its associativity:

• Addition and subtraction
• Parenthesis
• Unary signs (Positive and negative signs)
• Multiplication, division, and modulo

Answer 13

Parenthesis - left to right
Unary signs (Positive and negative signs) - right to left
Multiplication, division, and modulo - left to right
Addition and subtraction - left to right

Question 14

What do you call a statement that stores a computation result and perform arithmetic operations in a program?

Answer 14

Arithmetic operators

Question 15

What is a keyword and a reserve word?

Answer 15

Keywords are reserved by the language and has a meaning to the compiler.

Reserved words are for special use and cannot be used as an identifier.

Question 16

What are separators?

Answer 16

They are used to separate tokens

Question 17

Identify which is not considered as a separator:

1. comma
2. tabs
3. spaces
4. colon
5. newlines
6. semicolon

Answer 17

Newline, spaces, and tabs