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I have made a GUI application using Ruby\FXRuby and i would like to be able to connect it to a database to save the data that is entered in the application. It's a simple application that saves a person's contacts (name, address, email, etc.). I'm trying to use SQLite3 but i have not been able...

I'm trying to create a graph with 'n' vertices and create edges between all the vertices. Here is the code for adding vertices and edges: private static void setVertices(int n) { int vertexLength = n; /* Add vertices */ for(int i = 0; i < vertexLength; i++) {...

hello, i'm new to ruby and i'm trying a to write a simple greeting program that accepts input from the user (user's name) but its not completely working the way i would like it to. It doesn't print out the goodbye messages and doesn't work when nothing is typed in (Hello World should print out)...

i'm trying to do one of the exercises from my OS book. the exercise is about creating a multithreaded solution that performs matrix multiplication.(A[i,j] x B[i,j]= C[i,j]) it says that for this exercise you need to calculate each element C[i,j] in a separate worker thread. This will involve...

i'm trying to learn prolog and one of the problems that i am trying to do is the following: Write a Prolog program that takes the total number of flags of each color and some initial arrangement of flags. The initial arrangement may be empty, or it may specify that certain positions in the line...

i need help on writing some code that will take each line of a file and determine if it contains the right length of characters for each line (150 max). Each line in the file contains 5 fields and has an assigned number of characters: name (0-49) address (50-59) phone number (60-73) status...

i'm trying to write a predicate that takes a list and a pattern and determines if the pattern exists in the list. for example: list = [r,r,b,g,y] pattern = r,r occurs([X,Y|_],X,Y). occurs([_|L],X,Y) :- occurs(L,X,Y). this kind of works for a pattern of two, but if the...

i need help on how to write a predicate that will duplicate the items in a list, where the left argument is a list and whose right argument is a list consisting of every element in the left list written twice.