3.3-3.4 Sequencing, Selection, and Iteration Notes and Hacks

• Notes
  • 3.3
    • an Algorithm is a set of instruction that accomplish a task
      • Sequencing
      • Selection
      • Iteration
    • Mathematical Expressions
      • Examples of arithmetic operators:
      • Modulus operator divides the given numeratior by the denominatior to find the result.
  • Strings
    • Examples of strings in pseudocode:
• Hacks
  • Hack #1
    • Sequencing
    • Selection
    • Iteration
  • Hack #2
    • Crossword Puzzle
    • Find the solution
  • Hack #3
    • Quiz

Notes

3.3

an Algorithm is a set of instruction that accomplish a task

Sequencing

• The order of how you do something
• Like the instructions of a teacher and howo you follow them

Selection

• Allows the algorithm to make a decision based on if a condition is met
  • Go to the gas station if your tank is empty, dont if its full.

Iteration

• A loop that does something over and over again until a condition is met

Mathematical Expressions

• Sequential statements specify how signals are assigned and the process that is executed as a whole.
  • Execute in the order in which they appear

Examples of arithmetic operators:

-Addition: a+b -Subtraction: a-b -Multiplication: a*b -Division: a/b -Modulus: a MOD b (a and b can be string or number)

Modulus operator divides the given numeratior by the denominatior to find the result.

• The syntax is %.

Strings

• String concatenation joins two or more strings end to end to make a new string

Examples of strings in pseudocode:

• len (str)
  • returns the number of character is str
  • len(“hello”) returns 5
• concat (str1, str2)
  • returns a single string consisting of str1 followed by str 2
  • concat(“hello”,”world”) return ‘hello world’
• substring (str1, str2, length)
  • returns a substring of consecutive character from str1, starting the character at position ‘start’ and containing ‘length’ character
  • substring (“hello”,”world”, 4,5) returns ‘lo wor’

Hacks

Hack #1

Sequencing

• The order of how you do something
• Like the instructions of a teacher and howo you follow them
• It was 1-5 on the image

Selection

• Allows the algorithm to make a decision based on if a condition is met
  • Go to the gas station if your tank is empty, dont if its full.
• It was #3 on the image

Iteration

• A loop that does something over and over again until a condition is met
• Was #4 on the image

Hack #2

Crossword Puzzle

• 1 down: Iteration
• 2 down: Selection
• 3 accross: Sequence

Find the solution

Hack #3

Quiz