Increment/Decrement

Question

Hey,

Can someone explain to me, why the output is "0" I don't understand why the last "++" are having no influence to the result at all.

https://code.sololearn.com/cCpIZIdU8AUO/?ref=app

Answer 1

in example below
v = v // v=6
then at right side do
v++
but variable is assigned yet, and this v++ at right is lost

int v = 6;
v = v++;
System.out.println(v); //6

Answer 2

Don't write code like v=v++. It leads to undefined behaviour.

Answer 3

Hey Zemiak,

But this would be right also?
int v = 6;
Int x;
v = v++;
x = v;
System.out.println(v); //6
System.out.println(x); //6

So the ++ afterwards is always lost?? I was under the impression that it increments the variable right after assignment where it is used.

Answer 4

I understand your intuition, but this behavior is the same for c++, c#, javaScript, php ..
Maybe this is one of the reasons why some new languages ​​such as python or ruby ​​do not have the ++ operator.

Answer 5

// compare with this
int a=6;

a = a++ + a++;
// a; (b=a+1); c=a+b; d assign c; (e=b+1); (e lost)
// 6: (7=6+1); 13=6+7; result assign 13

System.out.println( a ); // 13

Answer 6

I still ask myself why the last ++ does nothing. Shouldn't it increase the variable after the command where it is used - so before the print out?