In these examples why is a first assigned value 0 before the increment or decrement?

Answer 1

What examples?

Answer 2

usually it's like this

for (var i = 0; i < 10; i++) { // code here }

this means i counts from 0 to 10
i = 0 is the first time '// code here' is executed
i = 1 is the 2nd time
...
i = 9 is the 10th time (last time)
i = 10 doesn't match the condition '< 10'
so the for loop is done.

you could also start counting from 1, but for it to excecute 10 times you'd have to write

either
(var i = 1; i <= 10; i++)
or
(var i = 1; i < 11; i++) which might confuse you

let me know if this was your problem

Answer 3

well b isn't defined.
if you mean y, then yes x is 11

Answer 4

the increment decrement exercise state x=0, y=10; x=y++. If we're going to increment y to produce x why assign x value 0 in the first place?

Answer 5

OK I got it yes thanks!

I was just wondering is it really necessary to assign a value to x?
Is this incorrect:
y=10;
var x=b++;

result: x=11?