Computer Science Core Concepts

What is Computer Science? Computer Science is the creation and adaptation of technology

What is programming?

Instructions for a computer to follow to perform a task Programming Instructions for a computer to follow to perform a task

What is an algorithm?

Algorithms A process to follow to solve a problem; a set of instructions

What is A variable?

Variable A symbol or name that represents a value Can declare, assign or change the value of variables

What is Boolean?

Boolean A data type that returns only true or false. It will not return numbers*, words, etc.. True=1 False=0 *the only numbers Boolean will return

What is A Comparator?

Comparators (aka Logic operators) Compare two or more Variables The result of the comparison is a boolean value Equal to == and Not equal to != or Greater than > not Greater than or equal to >= Less than < Less than or equal to <=

Comparators (con’t) x = 10 y = 20 What is the boolean value of the following expressions? x == y x != y x > y x >= y x < y x <= y

What is An if-else statement?

If-Else Statements When a comparison is True, then the if- block will be executed. And, if a comparison is False, then the else- block will be executed.

If-Else Statements examples y = 4 What is the boolean value of the following expressions? if (x > y and y != 5) if (x < y or x >= 5) print (“Hello!”) print (“Hola!”) else else print (“Bye!”) print (“Adios!”) if ((x-y)==4) print (“Bonjour!”) else print (“Au revoir!”)

What is Branching?

Branching A branch is a set of instructions that, when executed, cause the computer to begin execution of a different instruction sequence. Branching can use if-else or switch statements

What is a loop?

LOOPS Series of instructions that is repeated until a given condition is false

LOOPS (Types) for loop: executed at least once, and the number of repetitions is known while loop: repeatedly executed statement; will be executed 0-infinity times

What is iteration?

Iteration Iteration is the act of repeating a process Each time a loop runs, that is one iteration.

What is a function?

Functions A small set of instructions that defines how to complete a specific task The “Add ten to a number” is the function

You learned about ... Computer Science Programming Algorithm Variable Boolean Comparators If/Else Loops For Loop While Loop Iteration Function

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