Submitted by: Submitted by Bobrh
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Category: Science and Technology
Date Submitted: 07/31/2011 02:12 PM
How to write pseudocode
There are six basic computer operations
1. A computer can receive information
Read (information from a file)
Get (information from the keyboard)
2. A computer can put out information
Write (information to a file)
Display (information to the screen)
3. A computer can perform arithmetic
Use actual mathematical symbols or the words for the symbols
Add number to total
Total = total + number
+, -, *, /
Calculate, Compute also used
4. A computer can assign a value to a piece of data
3 cases
to give data an initial value
Initialize, Set
To assign a value as a result of some processing
‘=’
* x = 5 + y
to keep a piece of information for later use
Save, Store
5. A computer can compare two piece of information and select one of two alternative actions
IF condition THEN
some action
ELSE
alternative action
ENDIF
6. A computer can repeat a group of actions
WHILE condition (is true)
some action
ENDWHILE
FOR a number of times
some action
ENDFOR
The Structure Theorem (and the pseudocode we use to represent the control structures)
It is possible to write any computer program by using only three basic control structures: sequence, selection, repetition.
Sequence
Execution of one step after another. This is represented as a sequence of pseudocode statements:
Statement 1
Statement 2
Statement 3
Example:
Read three numbers
Add three numbers
Display total of three numbers
Selection...