Question

What I saw in an if statement was like this.

if((var = someFunc()) == 0){
   ...
}

Will the statement

(var = someFunc()) 

always return the final value of var no matter what environment we are in?

Answer 1

That is just a one-line way of assigning to a variable and comparing the returned value at the same time.

You need the parentheses around the assignment because the comparison operators have higher precedence than the assignment operator, otherwise var would be assigned the value of someFunc() == 0.