Values interpreted as variables

Question

I am coding a calculator, and in its current code has some variables of type "Console.ReadLine ()", and when running the code the values ​​of these variables are interpreted as other variables.
why?

for example:

string a = Convert.ToString(Console.ReadLine());

if (a == wow)
Console.WriteLine("WOW");

else
Console.WriteLine("wow");

there is an exemple code:
https://code.sololearn.com/cDffyb99aNE5/?ref=app

Answer 1

if you want to compare variables with string use quoation marks so the compiler know that you're comparing variable with string, not variable with variable

a == "wow"

Answer 2

thanks, I really dont think in this.
I was tried to make a new variable and compare, but isn't works too