console.clear();

let a;
console.log(a);

a = 15;
console.log("Ma variable a = "+a);

let b = 9;
console.log("Ma variable b = "+b);

console.log(a + " + " + b + " = " + (a+b));
console.log(a + " - " + b + " = " + (a-b));
console.log(a + " / " + b + " = " + (a/b));
console.log(a + " * " + b + " = " + (a*b));

a = "Bonjour";
b = "les amis";

console.log(a + " " + b);

a = true;
b = false;
console.log(a && b);
console.log(a || b);


a = new Date();
b = new Date();
b.setDate(a.getDate() - 61);
console.log(a.toLocaleDateString()+" à "+ a.toLocaleTimeString("fr-CH"));
console.log(b.toLocaleDateString()+" à "+ b.toLocaleTimeString("fr-CH"));

a = Math.PI;
b = "bonjour";
c = true;
d = new Date();
console.log(a + " est de type " + typeof a);
console.log(b + " est de type " + typeof b);
console.log(c + " est de type " + typeof c);
console.log(d + " est de type " + typeof d);