Linear Search

I'm thinking of a letter. Can anyone tell me (guess) what letter?
One good way to find it, is to ask me each letter in order.
That's an exhaustive search.
To a great extent, that's linear search.
You step through all the pieces of data until you find the one you want.
The algorithm is a bit more specific, but that's basically it.
In class excercise:
Let's assume an array of 15 characters.
Write a loop that set's a boolean value to true if the character 'c' is present.