sga | de novo sequence assembler using string graphs | Genomics library

Suppose I have a list of Strings like this:

["aesfa","gwopq","awefg"]

I would want to get all possible combinations between those Strings, something like this:

["aga","agw","age","agf", ... ,"sga","sgw", ... , "aqf","aqg"]

The strings inside the list have all the same lenght, but could be any lenght, and the list could contain different numbers of strings

I tried the following list comprehensions:

-getCombinations (z:zs) = [x:y | x <- z, y <- zs]

This gives me, obviously, a list of the combinations between all the characters of the first string and the rest of the strings (not the characters).

-getCombinations (z:zs) = [x:y | x <- z, y <- getCombinations zs]

This doesnt work if I dont do a pattern matching for the empy list, I did it like this:

getCombinations [] = []

but doing that make the function return always the empty list no matter what

weirdly enough, if I do:

-getCombinations (z:zs) = [x:[y] | x <- z, y <- head zs]

it gives me the combinations between the first two strings

I tried to extend that to get another String and I ended up with this:

getCombinations (z:zs) = [x:[y]++[w] | x <- z, y <- (head zs), w <- (head(tail zs))]

That gave me the combinations of the first three strings

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here is the html:

I have a dataframe like this:

I am writing a program for an assignment that has the following conditions:

1. 12 bars per case, represented by bars_per_case

2. A price of 1 per bar: price_per_bar

3. A case cost of 8: cost_per_case

4. A 10% cut: SGA

The program should ask the user how many bars were sold and calculate the SGA amount and total net gain cheer_proceeds. The program should have a different message depending on cheer_proceeds: "Congratulations ..." when cheer_proceeds >= 500 or "Sorry ..." when cheer_proceeds < 500.

The program should NOT accept a negative number of bars. If a negative number is entered, the program should NOT move forward to calculate totals until valid data is entered.

My problems are:

1. When I use the while loop, the last lines the if cheer_proceeds... keeps looping
2. When entering a negative number the code still continues

Where would I insert a break in order to stop the loop?

My code:

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I am calling a function in order to do a select statement in a bundled SQLite database. The function returns an array of structs. The database is being read correctly as I have put some print commands in the code. However the final array only has 1 row in it, which contains all the data, instead of 16 rows of structs.

The struct code, which is in databaseHelper.swift, is...

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