Scalar data types in Rust - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are scalar data types in Rust?

Scalar data types represent a single value. They include integers, floating-point numbers, Booleans, and characters.

beginner

Name the four main scalar data types in Rust.

The four main scalar types are: integers, floating-point numbers, Booleans, and characters.

beginner

What is the difference between an integer and a floating-point number in Rust?

An integer is a whole number without decimals, like 5 or -3. A floating-point number has decimals, like 3.14 or -0.001.

beginner

How many values can a Boolean hold in Rust, and what are they?

A Boolean can hold exactly two values: true or false.

beginner

What kind of values does the char type hold in Rust?

The char type holds a single Unicode scalar value, like a letter, number, or symbol, for example, 'a', '7', or '❤'.

Which of these is NOT a scalar data type in Rust?

A Array

B Boolean

C Integer

D Character

Arrays are compound types, not scalar types. Scalar types hold a single value.

What value types can a Boolean hold in Rust?

A 0 or 1

B Any number

C true or false

D Any character

Booleans only hold true or false values.

Which scalar type would you use to store the number 42?

A char

B floating-point

C Boolean

D integer

42 is a whole number, so it fits the integer type.

What does the char type represent in Rust?

A A string of text

B A single letter, number, or symbol

C A true or false value

D A decimal number

char holds a single Unicode character.

Which scalar type would you use to store the value 3.14?

A floating-point

B Boolean

C integer

D char

3.14 has decimals, so it is a floating-point number.

Explain the four main scalar data types in Rust and give a simple example of each.

Think about whole numbers, decimals, true/false, and single characters.

Why are scalar data types important in programming? How do they differ from compound types?

Consider how data is stored and used in small pieces.