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# Challenge 2014-01

### Curriculum Challenges 3.1

1. Write a subroutine that can be called to welcome a user and tell them how long it was since they last started SmallBasic
Hint: store the last time in a file in the current Program.Directory.
2. List all of the SmallBasic files in current Program.Directory.
3. Create a file in the current Program.Directory and use it to store a some sums that can be added to for the text challenge bellow.

### Text Challenges

1. Write a program that can do as many of the following sums as you can and output the answers.
The sums are input at text strings like “25+3” which need to be scanned and interpreted (parsed) to find the numbers and operations to do the sum (this is a Text challenge).
The program should read the sums from a file (created by curriculum challenge 3 or created manually).
Add or share more sums to test each other’s programs.

Example sums

• 25+3
• 15.7*91
• -12-8
• sqrt(81)
• 5+sqrt(9)
• (7+5)/4

### Graphical Challenges

1. Make a simple graphical calculator.
Perhaps the user enters 2 numbers in 2 textboxes and then presses one of 4 buttons to +, -, *, / with the result given in a third textbox.

### Maths Challenges

1. Write a program to calculate the number of ways that a ‘full house’ can be chosen by picking 5 cards from a normal pack of cards.
A full house has 3 of a kind and 2 of a kind.
Perhaps also do some other poker hands like a flush or straight.
2. You can try doing it randomly to get the approximate probability of such hands.
Remember any card can only be picked once so if I have already got two 8s, the chances of getting a third are reduced.

### Game Challenge

1. Write ‘pairs game’ where the players have to find image pairs.
Something like this.

### Community Suggestions

by Nonki

1. Draw G clef and F clef.
2. Draw wave figures of chords (e.g. C major, F minor, G 7th).
3. Make a scoreboard for any sports.

### Challenges

by Jibba Jabba

#### Properties and Operations

Briefly explain the difference between an Operation and a Property.
Using the words “has” and “does”.
For beginners.

#### TextWindow Challenge: – for intermediate skill level

Write a program that changes the TextWindow.BackgroundColor to all the colours available to the TextWindow and display (animate) the current color’s name in the TextWindow.Title.
To set TextWindow.BackgroundColor: 1st set the color then clear the window.

#### Good Coding Techniques

Identify/discover the usefulness of using good variables as opposed to just plugging values straight into functions and methods.
This is a 1st step toward writing extensible code.
May as well briefly define a function and method too.