Operator precedence in R Programming - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is operator precedence in R?

Operator precedence is the set of rules that determines the order in which different operators are evaluated in an expression.

beginner

Which operator has higher precedence: multiplication (*) or addition (+)?

Multiplication (*) has higher precedence than addition (+), so it is evaluated first.

beginner

How does parentheses affect operator precedence?

Parentheses change the order of evaluation by forcing the expression inside them to be evaluated first, regardless of normal precedence rules.

intermediate

What is the precedence order between logical AND (&&) and logical OR (||) in R?

Logical AND (&&) has higher precedence than logical OR (||), so && is evaluated before ||.

advanced

In the expression 3 + 4 * 2 / (1 - 5)^2^3, which operation is evaluated first?

The expression inside parentheses (1 - 5) is evaluated first, then exponentiation (^), then multiplication (*) and division (/), and finally addition (+).

In R, which operator is evaluated first in the expression 5 + 3 * 2?

A Depends on variable types

B Addition (+)

C Multiplication (*)

D Both at the same time

Multiplication (*) has higher precedence than addition (+), so 3 * 2 is evaluated first.

What does parentheses do in an expression like (2 + 3) * 4?

A They change the operator precedence to default

B They make the expression inside evaluated first

C They have no effect

D They delay evaluation until later

Parentheses force the expression inside to be evaluated first, so 2 + 3 is done before multiplication.

Which has higher precedence in R: logical AND (&&) or logical OR (||)?

A Logical OR (||)

B Depends on the expression

C They have equal precedence

D Logical AND (&&)

Logical AND (&&) has higher precedence than logical OR (||).

In the expression 2^3^2, which exponentiation is done first?

A 3^2 first

B 2^3 first

C Both at the same time

D Exponentiation is left to right

Exponentiation in R is right-associative, so 3^2 is evaluated first.

What is the result of 4 + 6 / 3 in R?

A 6

B 3.33

C 7

D 6 + 4 / 3

Division (/) has higher precedence, so 6 / 3 = 2, then 4 + 2 = 6.

Explain how operator precedence affects the evaluation of the expression 7 + 3 * 2 in R.

Think about which operation R does first without parentheses.

Describe how parentheses can change the result of an expression with mixed operators in R.

Consider how you can force R to do addition before multiplication.