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Flow Charts & Algorithms

A step-by-step procedure for solving a problem in a finite number of steps.

Algorithm

Problem Statement:

Algorithm Example

Find the sum of natural numbers from 0 to 50

START

IF N <= 50 THEN GOTO Step 4PRINT sumSTOP

Step 1:Step 2:Step 3:Step 4:Step 5:Step 6:Step 7:Step 8:

sum 0N 1sum sum + N N N + 1

Problem Statement:

Algorithm Assignment

Find the sum of any TWO numbers

Problem Statement:Check whether a number given by user is EVEN or ODD

Problem Statement:Find the largest of THREE numbers

 Flowchart is a type of diagram  that represents an algorithm or process, showing the steps as boxes of various kinds, and their order by connecting them with arrows.

Flow Chart

Terminal Symbol: indicates the starting or stopping point in the logic.

Input/Output Symbol:Represents an input or output process in an algorithm

Process Symbol:Represents any computational step or processing

Decision Symbol:Represents a decision in the logic involving the Comparison Of two values.

Flow Lines

Basic symbols

Basic symbols

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Three Basic Control Structures

Statemement a

Statemement b

Statemement c

SequenceSequence is a default control structure. Instructions are executed one after another

Selection structure test the condition and then executes one sequence of statements instead of another, depending on whether the condition is true or false

Selection

Condition p?

Statemement a Statemement b

T F

Selection

Condition p?

Statemement a

T

F

Selection

Repetition structure specifies the repetition of an action while some condition remains true. When the conditions of the control statement have been met and control passes to the next statement beyond the repetition structure

Repetition

Condition p?

Statemement block

T

F

Repetition

MAX VALUE1

Print“The largest value is”,

MAX

STOP

Y N

START

InputVALUE1,VALUE2

MAX VALUE2

isVALUE1>VALUE2

Example

http://www.google.co.in/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=sQgMe9pbB9ph8M&tbnid=0kc8WVNtfYPB8M:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.rff.com%2Fflowchart_samples.htm&ei=zHllUt3MKoymrQfC4IGwBg&psig=AFQjCNEnMDSzJRHIn7EqC80aCnKPlRvkFg&ust=1382468422762286

Example :largest of three numbers

Assignment questions

1.Check a given number is even or not

2.Display even numbers between 10&100