code, coed

Code or code means a system of letters, numbers, or symbols used to store, transmit, or encrypt information--
The scanner can't read the bar code if the package is damaged.
The telegraph used Morse code to send messages by wire.
Do you remember the security code?

Code ( also encode ) may also mean to encrypt information using a system of letters, numbers, or symbols--
Sergeant, code this message and send it to headquarters.
She is learning to code, and is planning a career change.

Code may also mean a set of rules and regulations, or, generally, ideas about how to behave--
Please read the code of conduct before using the pool.
"I could tell you a lot, but it's not in a gentleman's code..."

Coed or coed ( also spelled co-ed ) is short for coeducational, an old-fashioned term meaning a female college student--
Their mom was a coed in the 1950's; now many college students are female.
Times have changed; my daughter asked me what a coed is.

Coed may also describe a school or facility for both males and females--
This college was once all male; now it's coed.
Is this a coed dorm?

Now that you know that, you can say--
"She was the first coed to become an expert in computer code."

Note--"coded" is the past tense ( yesterday, or some time ago ) of "code", meaning to encrypt information using a set of letters, symbols, or numbers--
Who coded this message?