I don't understand this! Please help

Question

var a = 3
let b = a++
let c = -b

How come the value of 'c' was -3?

Answer 1

var a = 3 //initially
let b = a++ //post increment b become 3
let c = -b //now c=-b=-3 because value of b is -3 which assign to c
so the output is -3

Answer 2

a++
a--

this ++ or -- called increments and decrement operator..
it increased by 1 or decreased by 1 the value of variables..

there are two types.
post increments and decrement operator
and
pre increments and decrement operator..

a++ is post increments.
++a is pre increments.

post increments operator has the
priority has less then equal to..(=)operator
and
pre increments operator has the priority great than equal to operator..

now back to your question..
a=3;
b=a++

as you see a++ post increments operator it mean it assigned value firsr then increased by one..
so
b=3. and a become 4

third statement is
c=-b
as you know now b has the value is 3..
and you assigned b value with the sign- to c..

i.e c is -3
you must read this for better understand
https://www.sololearn.com/learn/2283/?ref=app

Answer 3

When you do “let b = a++”, b is set to a, THEN a goes up. So, after “let b = a++”, a = 4, and b is still 3. At “let c = -b”, b = 3, so you’re saying to the compiler “let c = -3”. If you put “let b = ++a”, then b AND a would equal 4.

Answer 4

Hi

Answer 5

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