NASIR ABBAS

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PRESENTED BY

• NASIR ABBAS

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FLOW CHART

• CONTENTS
• What is a flow chart?
• Flow chart symbols

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What is flow chart?

• Flow chart is a block diagram that reveals the
  structure and purpose of the program. Like a road
  map, flow charts are used to reveal how to go
  from a starting point to the final destination
  and can be used to display any amount of detail.
  Lines connecting the block used in the flow chart
  indicate the path followed by the information.
  The flow is valuable aid in writing a program.
  Flow charts usually break up large complex
  program into smaller logical units and it becomes
  easier to make changes and corrections.

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FLOW LINE

• The line with an arrow head represents the
  direction of flow of information in the flow
  chart between various blocks.

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TERMINAL

• An oval shape symbol is used to represent the
  start of a flow chart as and the end of a flow
  chart as

STOP
START
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INPUT/OUTPUT

• A parallelogram is used to represent the
  generalized INPUT/OUTPUT statements. With INPUT
  X, Y or READ X, Y sign to take the two values
• Or with PRINT sign to write OUTPUT values
  contained on a terminal/screen as

READ X, Y
INPUT X , Y
PRINT A
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PROCESS

• A rectangular block is used to represent
  processing or computation like

SS2
XABC
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DECISION

• A diamond represents a comparison, question or
  decision. Depending upon the result of this
  comparison, computer decides a particular path to
  be followed. The decision box must have at least
  two exits, a third may be added if desired. A
  decision box may contain a simple question with
  YES or NO answer as shown in Fig. 1

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Fig. 1

• YES
• NO
• A part of the flow chart for decision whether N
  is greater than 33 or not

IS Ngt33
PRINT N
STOP
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CONNECTOR BLOCK

• A small circle is a connector symbol and is used
  to join various parts of a flow chart. These
  connector are used when a flow chart exceeds one
  page. A numeral is written inside the circle to
  identify the position where the connector joins
  or leaves the flow chart as shown.

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DEVELOPING OF FLOW CHARTS

• Example1
• Develop a flow chart to illustrate how to
  contact to your friend on mobile phone.

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SOLUTION

• The first step is to check whether the mobile
  phone is in working order.
• Figure 2
• NO
• 
  YES
• A part of the flow chart
  representing step 1

IS THE MOBILE PHONE SET IN WORKING ORDER?
STOP
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• 2. Then the next step is to dial the number of
  your friend
• After the number being dialed, note the response
  from the other end (Figure 3). If the number is
  busy then return to the wait process and dial
  the number again after some time. If not then
  listen the bell and wait for reply. If no reply,
  it will mean no body is present to attend the
  call. Put mobile phone into the pocket.
• If some body replied then inquire for your
  friend. If your friend is not available then
  leave the message for him. If available then talk
  to him (Figure 4).

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IS THE MOBILE PHONE SET IN WORKING ORDER?
NO
STOP
YES
DIAL THE NUMBER
WAIT
TELEPHONE ENGAGED?
YES
A part of the flow chart representing step 2 and 3
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YES
TELEPHONE ENGAGED
WAIT
NO
IS YOUR FRIEND AVAILABLE
ANY REPLY?
YES
YES
TALK
NO
LEAVE MESSAGE FOR HIM
CENCEL THE CALL
STOP
A part of the flow chart representing step 4
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IS THE MOBILE PHONE SET IN WORKING ORDER?
NO
YES
DIAL THE NUMBER
WAIT
TELEPHONE ENGAGED?
YES
YES
IS YOUR FRIEND AVAILABLE
ANY REPLY?
YES
TALK
NO
NO
LEAVE MESSAGE FOR HIM
CENCEL THE CALL
STOP
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THANKS FOR

• BEING ATTENTIVE