Integer, whole-valued positive or negative number or 0. The integers are **generated from the set of counting numbers 1, 2, 3**,… and the operation of subtraction. When a counting number is subtracted from itself, the result is zero; for example, 4 − 4 = 0.

## Moreover, what is Check expect in racket?

A check-expect expression must be placed at the top-level of a student program. Also it may show up anywhere in the program, including ahead of the tested function definition. … It is **an error for expr or expected-expr to produce an inexact number or a function value**.

**a list of pairs of exact integers**, where each pair represents a closed range of integers, and the entire set is the union of the ranges.

## Also question is, what is a char in racket?

A Racket character corresponds to **a Unicode scalar value**. Roughly, a scalar value is an unsigned integer whose representation fits into 21 bits, and that maps to some notion of a natural-language character or piece of a character.

## What are the types of integers?

**Integers come in three types:**

- Zero (0)
- Positive Integers (Natural numbers)
- Negative Integers (Additive inverse of Natural Numbers)

## Is 0 a real number?

Real numbers are, in fact, pretty much any number that you can think of. … Real numbers can be positive or negative, and **include the number zero**. They are called real numbers because they are not imaginary, which is a different system of numbers.

## What is a helper function racket?

A helper function is **a function that performs part of the computation of another function**. Helper functions are used to make your programs easier to read by giving descriptive names to computations. They also let you reuse computations, just as with functions in general.

## How do you write a function in racket?

You can call a function in Racket **by wrapping it in parentheses with the arguments after it**. This looks like (function argument …) . Operations like + and * are functions as well, and they use the same syntax as calling f or g . For more information and examples, see Function Calls in the Racket Guide.