Flowchart and algorithem

What is flowchart ?
 A flowchart is graphical or diagrammatical representation of
sequence of any problem to be solved by computer
programming language.
How it is useful?
 It is used to prepare first before writing any program. It is also
used to correct and debug a program flow after coding part is
completed.
1.flowchart :

Various symbol of flow chart with diagram:
 Start and stop :
 Input/output :
 Decision :
 Connector :
 Loop :
 Process or expression
representation :
 Direction of flow or
flow lines :

Flowchart examples :
1.Draw a flow chart to find factorial of given number :
F=1*2*3*4……..N
start
Read
N
F=1
I=1
Answer :
F=4

Process
no.2
I<=N
Print
“facto=“,f
stop
F=F*I
I=I+1
TrueFalse
N=F=4i=1
1)F=F*I=1*1=1
1) I=1 , F=1
2) I=2 , F=1
3) I=3, F=2
2)F=F*I=1*2=2
3)F=F*I=2*3=6
4)F=F*I=6*4=24
4) I=4, F=6
5) I=5, F=24
4!=1*2*3*4

2.Draw a flow chart to reverse given number.
e.g. 123 --- 321
 Answer :
Sum=0
start
Read
num
stop
r=num%10
Num>0
Num=num/10
sum=sum + r
print
“rvr=“,sum
TrueFalse
Num=123  1.
 r=123 % 10 =3
 Sum = 0 +3 = 3
 num = 123/10 =12
 2.
 r =12 % 10
=2 Sum = 0 +2 = 2
 num = 12/10 =1
 3.
 r =1 % 10 = 1
 Sum = 0 +1 = 1
 num = 1/10 =0
Output :
3 2 1
1) 123>0
2) 12>0
3) 1>0
4) 0>0

Result :
Through flow chart it is easy to understand
the logic and sequence of problem.
After drawing flowchart it becomes easy to
write any program.

2.Algorithms :
 An algorithms is a finite sequence of well
defined steps or operations for solving a
problem in systematic manner.
 These are rules for solving any problems in
proper manner. Instruction are written in
the natural language.
What is algorithms ?

Types of algirithms :
1. Divide and conquer
2. Greedy method
3. Branch and bound
4. Recursion
5. effectiveness

Pseudo code:
 It is language or part of language
used to convert program into easy
form.
 It allows the programmer to write
logic of flowchart or algorithm in
symbolic form.

Pseudo code can be used for folowing situation:
 Storage declaration
 Assignment of any value
 Procedure call
 Input / output
 Constant value

Examples of algorithms :
Step 1 : input number : num
Step 2 : I =1
Step 3 : f =1
Step 4 : repeat from step 4 to step 6 until I<=num
Step 5 : f=f*I
Step 6 : i=i+1
Step 7 : print “ factorial = “,f
Step 8 : stop
1.Write an algorithm to find factorial of given number :

Examples of algorithms :
Step 1 : input number : num
Step 2 : sum=0
Step 3 : repeat from step 3 to step 6 until num>0
Step 4 : calculate r = num % 10
Step 5 : calculate sum = sum * 10 + r
Step 6 : calculate num = num / 10
Step 7 : print “ reverse number = “,sum
Step 8 : stop
2.Write an algorithm to reverse of given number :

Flowchart and algorithem

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