18 Questions
What does a rune literal in Go represent?
A single Unicode character
Which of the following is NOT a valid way to write a rune literal in Go?
Raw string literals (' ')
When creating an interpreted string literal in Go, which characters cannot appear unescaped?
Backslashes
Why should double quotes be used to create an interpreted string literal in Go?
To interpret rune literals into single characters
Which type of string literal is easier for including backslashes, double quotes, or newlines in Go?
Interpreted string literal
Which prefix is used to indicate a binary literal in Go programs?
0b
What is the purpose of raw string literals in Go?
To create multiline strings
What is a way to represent an octal literal in Go that should be avoided as it can be confusing?
Using a leading 0 with no letter after it
In Go, what character can be used to group by thousands in base 10 for integer literals?
Underscore (_)
How are floating-point literals formatted when you want to use hexadecimal in Go?
Using the 0x prefix and the letter p for exponent
What is the impact of using underscores to format floating-point literals in Go?
It improves readability without affecting the value
Which type of literal allows you to specify an exponent using the letter 'e' in Go?
Floating-point literal
What character is used to delimit string literals in Go?
Backquotes (`)
What are the possible values for a variable of bool type in Go?
True or False
What is the zero value for a variable of bool type in Go if no initial value is assigned?
False
How many numeric types does Go have?
12
What is the zero value for all integer types in Go?
0
How many different numbers can be contained in a memory of 16 bits?
$2^{16}$
Study Notes
Literals in Go Programming
- There are five types of literals in Go: integer, floating-point, boolean, rune, and string literals.
Integer Literals
- An integer literal is a sequence of numbers.
- Integer literals are base 10 by default, but can be specified in binary (0b), octal (0o), or hexadecimal (0x) using prefixes.
- A leading 0 with no letter after it represents an octal literal, but is discouraged due to confusion.
- Underscores can be used to improve readability, but cannot be at the beginning or end of numbers, and cannot be consecutive.
Floating-Point Literals
- A floating-point literal has a decimal point to indicate the fractional portion of the value.
- They can also have an exponent specified with the letter e and a positive or negative number.
- They can be written in hexadecimal using the 0x prefix and the letter p for indicating any exponent.
- Underscores can be used to format floating-point literals.
Boolean Literals
- The bool type represents Boolean variables.
- Variables of bool type can have one of two values: true or false.
- The zero value for a bool is false.
Numeric Types
- Go has 12 numeric types, grouped into three categories: integer types, floating-point types, and complex type.
- Integer types include both signed and unsigned integers in a variety of sizes, from one to eight bytes.
- The zero value for all integer types is 0.
Rune Literals
- A rune literal represents a character and is surrounded by single quotes.
- Rune literals can be written as single Unicode characters, 8-bit octal numbers, 8-bit hexadecimal numbers, 16-bit hexadecimal numbers, or 32-bit Unicode numbers.
- There are also several backslash-escaped rune literals, with the most useful ones being newline, tab, single quote, and backslash.
String Literals
- There are two ways to indicate string literals: Interpreted String Literal and Raw String Literal.
- Interpreted string literals contain zero or more rune literals and interpret them into single characters.
- Raw string literals are delimited with backquotes and can contain any character except a backquote, with no escape character.
- Raw string literals are useful when including backslashes, double quotes, or newlines in the string.
Test your knowledge of Go program literals, including integer literals with different bases such as binary, octal, and hexadecimal. This quiz also covers the rare kind of literal found in Go programs.
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