Computer Science - 1 Fundamentals of Algorithms - 2 Developing Algorithms Using Flowcharts & 3 Developing Algorithms Using Pseudocode

Variable

a location in memory in which you can temporarily store text or numbers

The name of a variable is called:

'identifier' or 'variable identifier'

Assigning a value in Python:

=

Pseudocode

a detailed yet readable description of what a computer program or algorithm should do

Flowchart: round-edged rectangle

start and end

Flowchart: rectangle

calculation or assignment

Flowchart: parallelogram

input or output

Flowchart: rhombus

decision

Three basic programming structures:

- sequence
- selection
- iteration

INTEGER

whole number

REAL or FLOAT

numbers that have a decimal part

BOOLEAN

a single value of either TRUE or FALSE

CHARACTER

a single alphabetic or numeric character

STRING

a sequence of characters

sequence

statements are executed in the order they are written in

selection

the next statement to be executed depends on whether the condition being tested is true or false (e.g. IF)

iteration

repetition of code

iterative statements [3]:

- FOR...ENDFOR
- WHILE...ENDWHILE
- REPEAT...UNTIL

Pseudocode assignment

←

Pseudocode output

OUTPUT("[text]")

Pseudocode input

[var] ← USERINPUT

Pseudocode for loop

FOR [var] ← [no.] TO [no.]
...
ENDFOR

Pseudocode while loop

WHILE [condition]
...
ENDWHILE

Pseudocode if statement

IF [condition] THEN
...
ELSE IF [condition] THEN
...
ELSE
...
ENDIF

Boolean operator

comparative symbols like < and >

Boolean expression

a comparative statement such as '15 > [var]'

Pseudocode repeat until statement

REPEAT
...
UNTIL [condition]