R AND OR Operators

🔗 R AND ( & , && ) and OR ( | , || ) Operators

(Beginner → Interview Level)

In R, logical operators are used to combine conditions.
The most important ones are AND and OR.

1️⃣ AND Operator in R

The AND operator returns TRUE only if all conditions are TRUE.

Types of AND operators

🔹 Example: AND (&) with Vectors

Output

👉 Checks each element.

🔹 Example: AND (&&) with if condition

✔ Stops checking as soon as condition becomes FALSE.

2️⃣ OR Operator in R

The OR operator returns TRUE if at least one condition is TRUE.

Types of OR operators

🔹 Example: OR (|) with Vectors

Output

🔹 Example: OR (||) with if condition

3️⃣ AND / OR with Numeric Conditions

Output

Output

4️⃣ AND / OR in if–else Statements

5️⃣ Difference Between & vs && and | vs || ⭐ (Very Important)

| Feature | | | || |
|——|—-|—-|
| Type | Element-wise | Short-circuit |
| Works on | Vectors | Single logical value |

📌 Rule

• Use & and | → vectors

• Use && and || → if / while

6️⃣ Common Mistakes ❌

❌ Using && with vectors
❌ Using & inside if for multiple values
❌ Forgetting operator precedence

7️⃣ Interview / Exam Questions & Answers ⭐

Q1. What does AND operator do in R?

Answer:
Returns TRUE only when all conditions are TRUE.

Q2. Difference between & and &&?

Answer:

• & works element-wise on vectors

• && checks only the first element and is used in conditions

Q3. Difference between | and ||?

Answer:

• | is vectorized OR

• || is short-circuit OR for single conditions

Q4. Write a program to check if a number lies between 10 and 50.

Q5. What is short-circuit evaluation?

Answer:
R stops evaluating further conditions once the result is known (&&, ||).

✅ Summary

✔ & → AND for vectors
✔ && → AND for conditions
✔ | → OR for vectors
✔ || → OR for conditions
✔ Essential for if, loops, filtering data