Swift ternary expression

Question

I’m try to write a ternary expression for my code, but I keep getting an error:

“result values in '? :' expression have mismatching types '()' and 'Int'
c%2 == 0 ? d = 0: d = 1”

My code has the following:

let c = 7
var d = 0

c%2 == 0 ? d = 0 : d = 1

It should just set d to 0 or 1 depending on whether c is even or odd. I don’t understand what is wrong from the error message.