let a = 1
a += 2
print("a=", a)

let b = 2
b -= 1
print("b=", b)

let c = 5
c *= 5
print("c=", c)

let d = 10
c /= 5
print("d=", d)

let arr = [1, 2, 3]
arr[0] += 2
print(arr)

let obj = { name: "elmma", age: 26 }
obj.age -= 2
print(obj)