I'm having trouble with one of the projects in the Java course and could use some help.

Question

Hello everyone, I need some help. I'm currently working on the project at the end of Java module 3. This is what I have:

function main() {
var depth = parseInt(readLine(), 10);
//your code goes here

var i = 1
var p = 0
do {
p+=7;
i++;
}
while (p<depth);
console.log(i);
}

This is my incomplete solution to the given problem. I was testing it to make sure it worked as intended.
It did not, and I can't figure out why.

1: Depth in the tested case is equal to 42. The output for this function is 7, but I had expected it to be 6.
That means this loop is running a seventh iteration, exiting the loop when p equals 49 instead of 42.
Why is this loop running an extra time?

2:Though not imperative to my completion of the project, I still need an answer to this.
As an experiment, I put "p+7" in place of "p+=7" and ran it.
My curiosity was rewarded with a runtime error. Can someone explain why?

Answer 1

It also slips back 2 feet each night.

Answer 2

2. p+7 is an expression, not a statement

Answer 3

i=0