Bug Strange temp variable problem

Can anyone explain to me what's going on here? I'm just totally lost. I have a whole list of eight

buttonNumber == 1

entries just like this, and only the first one has a

Use of unassigned local variable 'tileValue'

error. This has happened before, but as you can see it has no problem with two other identical values. Removing the

else

doesn't cause the second one to show an error, BUT removing the line causes the next one to error. Changing the name doesn't help.

 

if you want to use tileValue like this give it a value first
int tileValue = 0;

 

Oh oops. I didn't notice I didn't do that because it wasn't erroring on the first line. Thanks a lot, I feel really stupid now.

 

FYI the first line isn't an error. It's okay to declare a variable without initialising it, so long as the compiler can work out that it will be initialised before first being used.

 

yeah what at @Peeling said, for example if it was a if else statement and both branches assigned to it, it would be fine not to initialize it first, since the compiler knows it will be done before it gets used. but since it was a if/if else compiler sees its possible it might not be initialized before use.

 

Thank you, that's quite interesting