algorithm and Pseudocode

1. Guess what games!!!

2. Guess what games? Guess if the
sample outline words is an algorithm
or Pseudocode
 Get value of A
 Get value of B
 C = A + B
 Display the value of C
pseudocode

3. Guess what games? Guess if the
sample outline words is an algorithm
or Pseudocode
algorithm
 Get the list of names
 Get the name being checked
 Set a counter to 0
 Do the following for each name on the list:
 Compare the name on the list to the name being
checked, and if the names are the same, then add
one to the counter
 Answer is the number indicated by the counter

6. FLOWCHART

7. OBJECTIVES
At the end of the lesson the students
can able to;
• Define the flowchart
• Identify the different symbols of
flowchart
• Create flowchart of a given
problem
• Trace the output of the flowchart

8. Flowchart
 A drawing that shows how a program
will operate, the steps that will be
followed, and the order in which they
will be followed
 is a representation, primarily through
the use of symbols, of the sequence of
activities in a system (process,
operation, function, or activity).

9. 2 Types of Flowchart
1. System flowchart – it is a graphic
representation of the procedures involved in
converting data on input media to data in output
form.
2. Program flowchart – it describes graphically in
detail logical operations and steps within a
program and the sequence in which steps are to
be executed for the transformation of data to
produce the needed output

10. Flowchart Symbols
 Start and End of program
 Computational steps or processing
function of a program
 Input or output operation
 Decision making and branching
 Connector or joining of two
parts of program

11. Flowchart Symbols
 Magnetic Tape
 Magnetic Disk
 Off-Page Connector
 Flow Line
 Annotation
 Display
Flowchart Symbols

12. This shape tells you where the flowchart begins and
ends. It shows the entry point of your flowchart and
the exit point. To designate the start of your
flowchart, you would fill this shape with words
like Start or Begin. The words you use are up to you.
To designate the ending point of the chart, this
shape is filled with words like End, Exit,
or Return.
Terminal or Terminator Shape

13. In most flowcharts, the rectangle is the most
common shape. It is used to show a process,
task, action, or operation. It shows something
that has to be done or an action that has to be
taken. The text in the rectangle almost always
includes a verb.
Computational/Process

14. A parallelogram is used to show input or
output. Examples of input are receiving a
report, getting an email, getting an order,
receiving data in some format, etc.
Examples of output are generating a
report, sending an email, etc.
Input or output operation

15. A decision asks a question. The answer to the
question determines which arrow you follow
out of the decision shape. For example, in the
shape below, if it is cloudy, you follow the
arrow down near the word Yes. If it is not
cloudy, you follow the arrow to the right near
the word No.
DECISION

16. The arrows flowing from the decision shape are
usually labeled with Yes, No or True, False.
But you can label them any way you want as
long as the meaning is clear. This shape has
one input arrow. It is usually at the top, but can
be on any corner. The decision shape can
have two or three exit points. If you need more
than 3 exit points, then you can use either of
the methods shown below.

17. A decision asks a question. The answer to the
question determines which arrow you follow
out of the decision shape. For example, in the
shape below, if it is cloudy, you follow the
arrow down near the word Yes. If it is not
cloudy, you follow the arrow to the right near
the word No.
Connector or joining of two parts of
program

18. This shape is supposed to look like a reel
of tape with a small portion of tape
extending from the reel. It represents
magnetic tape storage which is also called
sequential access storage.
Magnetic Tape

19. A cylinder represents a data file or
database. This shape can also represent
the magnetic disc itself. A hard drive is
referred to as direct access storage since
any sector on the drive can be accessed.
A tape is sequential access storage as the
data has to be read sequentially.
Magnetic Disk

20. This shape means the flow continues on
another page. A letter or page number in
the shape tells you where to go. It is an
alternative to using a circle.
Off-Page Connector

21. This shape means the flow continues on
another page. A letter or page number in
the shape tells you where to go. It is an
alternative to using a circle.
Flow Line

22. If two lines cross, you ignore the perpendicular
line and continue following the line to the next
shape. If there may be confusion as to the path,
you can insert a bridge or crossover, which is a
little bump on crossed lines. In RFFlow, you can
insert bridges on crossed lines by clicking
on Tools, Global Changes, and Add
Crossovers.
Flow Line

23. This shape was used to add a comment or
additional descriptive text to a software
flowchart. A dotted line should extend from
the comment to the symbol it references.
This shape is seldom used today.
Annotation/ comment

24. This shape is used to show that the
information is being displayed to the user.
It often refers to the display of a PC.
Display

25. Flowchart Development
1. Sequential
Steps are performed in a strictly
sequential manner, each step being
executed exactly once.

26. Create a flowchart the display
“Hello”

27. Create a flowchart that find the
area @ perimeter of a square

28. Create a flowchart that find the
area of the rectangle

29. Create a flowchart that display
the sum of 2 and 5

30. Create a flowchart the ask the user to
enter two number. compute and
display the sum

31. Create a flowchart the ask the user to
enter two number. compute and
display the sum

32. Flowchart on how to determine
the product of two numbers
ALGORITHM
SET Q=0
Get A
Get B
Compute the product of A and B
Print Q
PSEUDOCODE
SET Q=0
Get A
Get B
Q=A*B
PRINT Q

33. Flowchart Development
2. Selection
One of several alternatives is selected
and executed. It involves the use of
decision based on the given condition. It
uses decision block or the diamond-
shaped block. Alternative actions are
represented by the processing block.

34. Flowchart for determining Positive and
Negative Number
Start
INPUT N
N < 0
PRINT “POSITIVE” PRINT “NEGATIVE”
Stop
T
F

35. Flowchart to determining the greatest
of two numbers
T
F

36. Flowchart Development
3. Repetition
One or more steps are performed
repeatedly.

37. Flowchart that shows the printing of the
sum of the First Five Positive Integers

38.  Draw a flowchart to find
the sum of first 50
numbers.

39. Problem
 Draw a flowchart to find the largest of
three numbers A,B, and C

40. Flowchart
NO

41. Thank you for watching and
listening!!!