Numbers

Integers and Floats

Gleam has two numeric types: Int and Float. They are completely separate -- you cannot mix them in expressions.

Integer Arithmetic

let a = 10
let b = 3
a + b   // 13
a - b   // 7
a * b   // 30
a / b   // 3  (integer division, truncates toward zero)
a % b   // 1  (remainder)

You can use underscores for readability: 1_000_000.

Float Arithmetic

Float operators have a . suffix:

let x = 10.0
let y = 3.0
x +. y   // 13.0
x -. y   // 7.0
x *. y   // 30.0
x /. y   // 3.333...

The Int Module

The gleam/int module provides useful functions:

import gleam/int

int.to_string(42)          // "42"
int.to_float(42)           // 42.0
int.max(10, 20)            // 20
int.min(10, 20)            // 10
int.is_even(4)             // True
int.is_odd(3)              // True
int.absolute_value(-5)     // 5

The Float Module

import gleam/float

float.to_string(3.14)        // "3.14"
float.round(3.7)             // 4
float.floor(3.7)             // 3.0
float.ceiling(3.2)           // 4.0
float.truncate(3.7)          // 3

Comparison

Comparison operators work on both types, but you cannot compare an Int to a Float:

1 < 2     // True
1.0 <. 2.0 // True -- float comparisons use <. >. <=. >=.
1 == 1    // True

Your Task

Write a function called describe_number that takes an Int and returns:

• "positive" if the number is greater than 0
• "negative" if the number is less than 0
• "zero" if the number is 0

Call it in main with 42, -7, and 0, printing each result on a separate line.