JavaScript//Module 2//Code project

Question

Why is this code correct ?

function main() {
var depth = parseInt(readLine(), 10);
//your code goes here
var a = 0;
var x = 0;
do {
a += 7;
a -= 2;
x++;
}
while (a <= depth - 3);
console.log(x);
}

And not,
This

function main() {
var depth = parseInt(readLine(), 10);
//your code goes here
var a = 0;
var x = 0;
do {
a += 7;
a -= 2;
x++;
}
while (a <= depth - 5);
console.log(x);
}

Edit 1
The full question:
The snail climbs up 7 feet each day and slips back 2 feet each night.
How many days will it take the snail to get out of a well with the given depth?

Sample Input:
31

Sample Output:
6

Explanation: Let's break down the distance the snail covers each day:
Day 1: 7-2=5
Day 2: 5+7-2=10
Day 3: 10+7-2=15
Day 4: 15+7-2=20
Day 5: 20+7-2=25
Day 6: 25+7=32
So, on Day 6 the snail will reach 32 feet and get out of the well at day, without slipping back that night.

Answer 1

You said the 1st one working well..
The problem consists :
The snail climbs up 7 feet each day and if it not reached total depth ,then it slips back 2 feet each night. Otherwise it's finish.
So add 7feets, if depth is reached stop climbing else subtract 2 feets, a day is over..

Mention that where you not understanding.. pls add link of problem so that if possible I try it and reply....

Answer 2

Only the difference is in while condition a<=depth-3 and a<=depth-5...
read the question again.. else post link or full question here.. All not able to unlock it ..

Answer 3

Thanks for the edit.
What is your actual logic for depth-3 or depth-5 ? check it if input is 38
May you thinking about only 31 input..
I think the correct logic should be
a+2<=depth or a<=depth-2
climbing 7 feets may reach wall fully so then it don't fall 2feets. So no need to subtract , but if not reach then you need to subtract 2.

for easily understandable...

do {
a+=7;
x++;
if(a<=depth)
a-=2;
}while(a<=depth);

//I think, but not checked it.. don't confuse, if not work..

Answer 4

No, still it is not working. I tried all the ways you mentioned. Can you please explain me what the code should essentially consist of?