i++ vs. ++i prefix operator and postfix operator

24 Aug 2021

CodeStudy / prefixOperator / postfixOperator / prefix / postfix / operator / ++ / --

code	name	How
++i	prefix increment operator	`i = i+1;return i;`
i++	postfix increment operator	`final int t = i;` `i = i+1;` `return t;`
–i	prefix decrement operator	`i = i-1;return i;`
i–	postfix decrement operator	`final int t = i;` `i = i-1;` `return t;`

int x = 2;
int y = 2;
  
System.out.println(x * y++);// x=2, y=2 add later so, print 4(=2*2) then y =3
System.out.println(x * y++);// x=2, y=3 add later so, print 6(=2*3) then y =4

int x = 2;
int y = 2;
  
System.out.println(x * ++y);//x=2, y=2 add first so, y=3 then print 6(=2*3)

conclusion

++i wil give you slightly better speed and memory. If you are working with backend(Java), this is not important. However, if you are working with console games(C++), this is important.
i++ will happen after run the code
++i will happen before run the code

i++ vs. ++i prefix operator and postfix operator

conclusion

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