ex02.9_variables_number.js

const year = 1991;
let delayInSeconds = 0.00016;
let area = (16 * 3.14);
let halfArea = area / 2;

console.log(year); // -> 1991;
console.log(typeof year); // -> number;

let a = 10; // decimal - default 
let b = 0x10; // hexadecimal 
let c = 0o10; // octal 
let d = 0b10; // binary 
 
console.log(a); // -> 10 
console.log(b); // -> 16 
console.log(c); // -> 8 
console.log(d); // -> 2 

let x = 9e3;
let y = 123e-5;
console.log(x); // -> 9000
console.log(y); // -> 0.00123

let z = 0x21;
console.log(z);