"Microlator" (Micro:Bit Calculator)

input.onButtonPressed(Button.A, function () {
    A += 1
    basic.showNumber(A)
})
input.onButtonPressed(Button.AB, function () {
    basic.clearScreen()
    basic.showString("" + A + "+" + B + "=" + (A + B))
    ResetNum()
})
function ResetNum () {
    A = 0
    B = 0
}
input.onButtonPressed(Button.B, function () {
    B += 1
    basic.showNumber(B)
})
let B = 0
let A = 0
A = 0
B = 0