Integer type in R Programming - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of integer division in R?

Consider the following R code:

x <- 7L
result <- x %/% 2
print(result)

What will be printed?

R Programming

x <- 7L
result <- x %/% 2
print(result)

A 3

B Error: non-integer division

C 4

D 3.5

💡 Hint

The operator %/% performs integer division, which discards the remainder.

In R, %/% divides two numbers and returns the integer quotient by discarding any remainder. So 7 %/% 2 equals 3.

❓ Predict Output

intermediate

What is the type of an integer literal in R?

What is the output of this code?

typeof(5L)

R Programming

typeof(5L)

A "double"

B "numeric"

C "integer"

D "logical"

💡 Hint

The suffix L forces the number to be an integer type.

In R, adding L after a number makes it an integer literal. typeof(5L) returns "integer".

🔧 Debug

advanced

Why does this integer overflow happen?

Examine this R code:

large_int <- 2147483647L
result <- large_int + 1L
print(result)

What is the output and why?

R Programming

large_int <- 2147483647L
result <- large_int + 1L
print(result)

A -2147483648

B 2147483648

C NA

D Error: integer overflow

💡 Hint

R integers are 32-bit signed and wrap around on overflow.

The maximum 32-bit signed integer is 2147483647. Adding 1 causes wrap-around to -2147483648 due to overflow.

🧠 Conceptual

advanced

What happens when mixing integer and double in arithmetic?

What is the type of the result of this R expression?

typeof(5L + 2.0)

R Programming

typeof(5L + 2.0)

A "complex"

B "integer"

C "numeric"

D "double"

💡 Hint

R converts integers to doubles when mixed in arithmetic.

When an integer and a double are combined in arithmetic, R converts the integer to double. So the result is double type.

❓ Predict Output

expert

How many elements are in this integer vector after coercion?

What is the length of the vector created by this code?

vec <- c(1L, 2.5, 3L, TRUE, "4")
length(vec)

R Programming

vec <- c(1L, 2.5, 3L, TRUE, "4")
length(vec)

A 4

B 5

C 3

D Error: incompatible types

💡 Hint

All elements are coerced to a common type in c().

The vector has 5 elements. R coerces all to character because of the string "4". length() returns 5.