c - Is this code undefined behaviour? -

i have variable i:

int i; if(b){     i=1; } else{     i=-1; } 

is i undefined behavior because of int i; exists? or should int i=0 first?

absolutely fine.

you initialising i on program control paths, , not reading value until initialisation complete.

i prefer using ternary operator in such instances.

int = b ? 1 : -1;

as that's less vulnerable accidental reference uninitialised i.