Writing PseudoCode.md

Pseudocode

Pseudocode is meant to be a high-level way of representing an algorithm without tying it to a specific language.

Mathematical Operations

Assignment: ← or := Example: c → 2r, c:= 2r

Comparison: =, ≠, <, >, ≤, ≥ Arithmetic: +, −, ×, /, mod Floor/ceiling: ⌊operand⌋, ⌈operand⌉ Example: a ← ⌊b⌋ + ⌈c⌉ Logical: and, or Sums, products: Σ Π Example: h ← Σa∈A 1/a

Keywords

START: This is the start of your pseudocode. INPUT: This is data retrieved from the user through typing or through an input device. READ / GET: This is input used when reading data from a data file. PRINT, DISPLAY, SHOW: This will show your output to a screen or the relevant output device. COMPUTE, CALCULATE, DETERMINE: This is used to calculate the result of an expression. SET, INIT: To initialize values INCREMENT, BUMP: To increase the value of a variable DECREMENT: To reduce the value of a variable

Conditionals

IF — ELSE IF — ELSE

IF you are happy THEN
    smile
ELSE
    frown
ENDIF

IF you are happy THEN
    smile
ELSE IF you are sad
    frown
ELSE
    keep face plain
ENDIF

Case

INPUT color
CASE color of
    red: PRINT "red"
    green: PRINT "green"
    blue: PRINT "blue"
OTHERS
    PRINT "Please enter a value color"
ENDCASE

Iterations

FOR structure

FOR every month in a year    
	Compute number of days
ENDFOR

WHILE structure

PRECONDITION: variable X is equal to 1
WHILE Population < Limit    
	Compute Population as Population + Births — Deaths
ENDWHILE

Functions

Function clear monitor
  Pass In: nothing
  Direct the operating system to clear the monitor
  Pass Out: nothing
Endfunction

To emulate a function call in pseudocode, we can use the Call keyword

call: clear monitor

Program Mapping

PROGRAM makeacupoftea
END

Exception Handling

BEGIN 
    statements 
EXCEPTION 
    WHEN exception type 
        statements to handle exception
    WHEN another exception type 
        statements to handle exception
END

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