omicrongambit

Lecture 1: Random variables

• Basic concepts in probability theory (Chap 1.1-1.5)
• Discrete and continuous random variables (Chap 2.1-2.3)

Lecture 2: Expectation

• Calculating probabilities using CDF and PDF (Chap 2.2-2.3)
• Expectation, variance and moments(Chap 2.4)
• The Markov inequality (Chap 2.4)

omicrongambit

A distinction should be made between the following 3 data types in Java:

1. The String "[2, 3, 4]" representing the numbers [2, 3, 4]
2. a primitive array of ints representing the numbers [2, 3, 4]
3. a List<Integer> representing the numbers [2, 3, 4]
4. There's another thing called Array<Integer>, which you may accidentally be using without realizing, but don't worry about this for now

Java doesn't have [2, 3, 4] as a built in construct. You'll get a compiler error because it's not valid Java syntax to assign such a thing to a variable. Ask ChatGPT how to create a primitive array of [2, 3, 4], the syntax is slightly different.

omicrongambit

/** 
  There is a paradigm shift in assignment 1 and assignment 2 in terms of 
  "inversion of control": https://en.wikipedia.org/wiki/Inversion_of_control.
  
  The "main" method of a Java program is the entrypoint to start the program.
  In assignment 1, your main program was invoked.
  In assignment 2, a main program, which you don't control, invokes your code stubs.
*/ 
public class Assignment2 { 
  // Suppose the assignment told you to implement a method that matches this signature

omicrongambit

====== Compiling your code ======
Compiling: ['UserInputTest.java']...
====== Running JUnit on your code ======
[FAIL] Test int input with value 1000000
   -> Expected integer 1000000 to be printed as '1000000', but got: ''. ==> expected: <1000000> but was: <>
[FAIL] Test string input with Belgium replacement
   -> Expected 'Brugge is in Belgium' to be replaced by 'Southern Netherlands' and truncated to 30 characters, but got: ''. ==> expected: <Brugge is in Southern Netherla> but was: <>
[FAIL] Test invalid input type
   -> Expected error message 'Your type of input is not valid.' for invalid input type, but got: ''. ==> expected: <true> but was: <false>
[FAIL] Test the string input from first example

omicrongambit

/** 
 Reproduces "No line found" error
*/
public class UserInput {
  public static void main(String[] args) {
    Scanner s = new Scanner(System.in);
    s.nextLine();
    s.nextLine();
    s.nextLine();
  }