What makes --?

Question

I don't understand what -- do
I know that x=-1 =1
and x-=1 is 1 too
but what do --?
when you can German pls in German
thanks for help

Answer 1

i cant't german, but...
x=5
x--
output...x=4
x--
output...x=3

Answer 2

@Thore (re: Der erste Teil der Frage / regarding the first part of the question):

x = -1 ---> im wirklichkeit, x ist: -1 (in actuality, x is -1)
x -= 1 ---> x weniger oder "minus" einen / subtrahiert einen vom aktuellen Wert von x (x less or "minus" 1 / subtracts 1 from the current value of x)

* Englisch ist meine Muttersprache (English is my mother tongue)

Answer 3

thanks this help me very much

Answer 4

Another example:

for(int floor = 3; floor > 0; floor--)
{
cout << "Current floor is" << floor << endl;
}

cout << "Now on ground floor";

Answer 5

Danker. Nien know german

Sorry ;)

Answer 6

and teach me german is
unterrichte mich in Deutsch

:)

Answer 7

;D

Answer 8

by the way...teach me german xD

Answer 9

:O

Answer 10

by the way is in german nebenbei

Answer 11

x++ or x-- is known as postfix
++x or --x is known as prefix

Difference between postfix and prefix:
int x = 5;
// Postfix
int y = x++; // First is the assignment (y = x), then the x variable is incremented by one (x = x + 1), so first y = x = 5, then x = 6
// Prefix
int x = 5;
y = ++x; // First x is incremented, then is the assignment, so x = 5 + 1, then y = x = 6