playgrounds/ learn to code 2/ 3 gems, 4 switches/ problem with conditons in while loop

Question

monkeymafia OP

Created Mar ’19

Replies 2

Boosts 0

Views 5.2k

Participants 3

hello all,

I am at the beginning of learning swift with the ipad playgrounds.

in the chapter, where you have to go through a labyrinth till you collected 3 gems and toggled 4 switches, I have the following problem.

ar numberGem = 0
var numberSwitch = 0

}

func direction() {
    if isBlocked && isBlockedLeft {
        turnRight()
    } else if isBlocked && isBlockedRight {
        turnLeft()
    }
}
func gemSwitchVar() {
    if isOnGem {
        collectGem()
        numberGem += 1
    } else if isOnClosedSwitch {
        toggleSwitch()
        numberSwitch += 1
    }
}
while numberGem < 4 && numberSwitch < 5 {
    gemSwitchVar()
    direction()
    moveForward()
}

the while loop always stops after the figure collected 3 gems. It does not continue till it also toggled 4 switches. I always thought that with AND both conditions had to be fullfilled. And the OR operator would display the behaviour it does now.

I had the same problem with a while loop in an earlier chapter where I tried a while loop like

while !isBlocked && !isBlockLeft && !isBlockedRight

to make my figure walk till the end of the course, which was blocked in the upper way.

Where is my thought error.

Boost

Answer 1

thelastwaltz OP

Apr ’19

Do you necessarily need to set both the number of gems && number of switches as a condition for continuing? IIRC, you collect all of the gems before you toggle all of the switches, so you can have you line 22 as:

while numberSwitch < 5 {

as the number of gems collected is irrelevant - you have to keep going until all switches have been toggled.

(If I got it the wrong way round, and the last item to collect is a gem, not a switch, simply set line 22 as 'while numberGem < 4 }'

0

Answer 2

Diego_Kazmo OP

Jun ’21

guys this the the answer for this question:

var gemCounter = 0

var switchCounter = 0

func direction() {

if isBlocked && isBlockedLeft {

turnRight()

} else if isBlocked && isBlockedRight {

turnLeft()

}

func gemVar() {

if isOnGem {

collectGem()

gemCounter += 1

}

func switchVar() {

if isOnClosedSwitch {

toggleSwitch()

switchCounter += 1

}

while !isBlocked || !isBlockedLeft || !isBlockedRight && switchCounter != 4{

moveForward()

direction()

if gemCounter < 3 {

gemVar()

} else if switchCounter < 4{

switchVar()

}

0