Day 22 / Mar 30 (Wed)¶

Morning Exercise: Sum Element Every N Numbers¶

Write a function that checks if every two, three, n numbers in a sequence are followed by their sum.

def isSumAfterN(n: Int, ns: Seq[Int]): Boolean = ???

Write tests first (using ScalaTest test framework).

Code Review¶

An interactive session that demo'es the following:

1. How to use GitHub for collaborative development
2. git on command line
3. Code refactoring with test support (sbt test and IntelliJ IDEA)
4. Contribute to a project using pull requests

Pair Programming¶

Pair programming

Calculator Again¶

Create a command-line application that reads a file with a series of math operations (one on each line) and gives the total at the end.

The following operations are supported:

1. + (sum)
2. - (subtract)
3. * (multiply)
4. / (divide)
5. - (negation) (WARNING: The same symbol with subtraction)

The application should suppport PRINT operation that prints out the current total to the standard output (stdout) when it appears in a operation file. There can be zero, one or many PRINT commands.

Operation file should support comments (as lines starting with # or //).

A sample operation file:

# + 4 5
- 8
+ 5
-
PRINT
- 7
PRINT
PRINT
/ 2

Working in pairs¹:

• (daniel,leo)
• (ania,krzysiek)
• (damian,janek)
• (rafal,adam)
• (grzegorz,mateusz)

Schedule¶

1. 11:45 - 12:30 Lunch break
2. 12:30pm - 1:35pm
3. 1:40pm - 2:30pm