I cant set 2 variables to - each other and equal a third variable in swift

Question

I cant set 2 variables to - each other and equal a third variable in swift I'm trying to make var1 - var2 == var3 work in swift but I get Result of operator '==' is unused when I use == and when I use = I get Cannot assign to value: binary operator returns immutable value this is the code I'm working on.

var pices1 = 1
var pices2 = 1
var warmup: Int = 60
var nexx: Int = 60

func logic() {
    if count  <  10 {
        warmup = 5
        count - warmup == nexx
        pices1 = 1
        pices2 = 1
    }
}

Answer 1

== is for checking if two values are equal. = is for assigning a new value to a variable.

Just like when you define a new variable, the destination is on the left and the new value is on the right.

var warmup: Int = 60

In your case, you'll want the following.

nexx = count - warmup