console.clear();
let a;
console.log("Contenu de a: ", a);
a = 15;
console.log("Ma variable a = ", a);
let b = 9;
console.log("Ma variable b = ", b);
console.log("15 + 9 = ", a + b);
console.log("15 - 9 = ", a - b);
console.log("15 * 9 = ", a * b);
console.log("15 / 9 = ", a / b);
a = "Bonjour";
b = "les amis";
console.log("bonjour les amis");
console.log(`bonjour ${b}`);
a = true;
b = false;
console.log("true AND false = ", a && b);
console.log("true OR false = ", a || b);
a = new Date();
b = new Date();
b.setDate(a.getDate() - 61);
console.log("Date et heure: ", a.toLocaleString());
console.log("Date: ", a.toLocaleDateString());
console.log("Heure: ", a.toLocaleTimeString());
console.log("Type de a: ", typeof a);
console.log("Type de b: ", typeof b);
let c = true;
let d = new Date();
let e;
let f = 12345678987654321n;
console.log("Type de c: ", typeof c);
console.log("Type de d: ", typeof d);
console.log("Type de e: ", typeof e);
console.log("Type de f: ", typeof f);