The document provides information on problem solving and office automation. It discusses key concepts like algorithms, program development cycles, and control structures. For algorithms, it covers characteristics, representations using flowcharts and pseudocode, and examples. The main program development methodologies covered are the program planning method and waterfall method. Control structures discussed include sequence, selection, and looping. Examples provided include finding largest of three numbers, quadratic equation, swapping variables, and checking leap year.

1. UNIT - 3
PROBLEM SOLVING
AND
OFFICE AUTOMATION

2. Program
• Program is a collection of instructions that
will perform some task.

3. Problem Solving Steps
• Analyse the problem.
• Identify the solution for the problem and
divide it into small task.
• Algorithm has to be prepared.
• Based on the algorithm the program will
be created.
• Then it has to be executed.

4. Program Development Cycle
Methodologies
• Program planning method
• Waterfall method etc,.

5. Program planning method
Specification
Review
Informal Design
Test & Debug
Coding
Formal Design
Maintaining

6. • Specification review
– collect the requirements
– understand the requirements
• Informal Design
– Identifies the major tasks
– Identifies the subtasks
• Formal Design
– It converts the informal design to some format
that can be understand by others.

7. • Coding
– It converts the Design into Programs.
– It translate these programs to machine
language.
• Test & Debug
– It use sample data to test whether it works
properly.
– It also eliminate the errors.

8. • Maintaining
– It Modifies the programs if necessary.

9. Waterfall method
Feasibility
Analysis
Maintenance
Testing
Impl
Design

10. • Feasibility
–It determines whether it is possible to
create the project or not.
–It also produce the plans and the
estimates.
• Analysis
–It get the requirements from the
customer.
–It analysis the requirements.

11. • Design
–It is the process of designing how the
requirements to be implemented.
• Implementation
–It converts the designs into code.
–After coding it use language translators
to compile the code.

12. • Testing
–Here the modules are integrated
together.
–Then the project is tested and find
whether it meets the customer/user
requirements.
• Maintenance
–It make modifications based on the
customer feedbacks.

13. Algorithm
• Algorithm is a finite sequence of
instructions required for producing the
desired result.

14. Characteristics
• The steps in the algorithm must be
unambiguous .
• It should be written in sequence.
• Ensure that the algorithm will terminate.
• It should conclude after a finite number of
steps.

15. Factors used to judge the algorithm
• Time
• Memory
• Accuracy
• Sequence etc,.

16. Representations
• Flowcharts
• Normal English
• Pseudo code etc,.

17. Example
• Addition of two numbers
Step1: Start
Step2: Read a, b
Step3: Add the value of a with b and
store the result in c.
Step4: Display the value of c
Step5: Stop

18. Flowcharts
• It is the pictorial representation of the
algorithm.

19. Flowchart Symbols
• Terminal symbol
– It is used to represent the start, end of the
program logic.
• Input/Output
– It is used for input or output.
• Process Symbol
– It is used to represent the calculations, data
movements, initialization operations etc,.

20. • Decision Symbol
– It is used to denote a decision to be made at
that point
• Flow lines
– It is used to connect the symbols
• Connectors
– It is used to connect the flow lines.

21. Guidelines for preparing flowcharts
• It should be simple.
• Standard symbols should be used.
• The flow lines should not intersect each
others.
• In case of complex flowcharts use the
connectors symbols.

22. • Only one flow line should enter the
process symbol and only one flow line
should come out from a process symbol.
• Only one flow line used with the terminal
symbol.
START
STOP

23. • Only one flow line should enter the
decision symbol and two or three flowlines
may leave from the decision symbol.

24. Benefits of Flowcharts
• Makes Logic Clear
• Communication
• Effective Analysis
• Useful in coding
• Useful in Testing etc,.

25. Limits of Flowcharts
• It is difficult to use flowcharts for large
program
• Difficult to modify
• Cost etc,.

26. Pseudocode
• Pseudo means imitates and code means
instruction.
• It is formal design tool.
• It is also called Program Design Language.

27. Keywords
• READ,GET
• PRINT,DISPLAY
• COMPUTE,CALCULATE

28. Guideline for writing Pseudocode
• Steps should be understandable
• Capitalize the keyword.
• Indent to show hierarchy.
• End multiple line structure etc,.

29. Example
READ a,b
C=a+b
WRITE C
stop

30. Example
READ a,b
IF a>b
PRINT a is greater
ELSE
PRINT b is greater
ENDIF
stop

31. Advantage & Disadvantage
• It can be easily modified
• It can be understood easily
• Compare to flowchart it is difficult to
understand the program logic.

32. Sequence control structure
Flow chart Pseudocode
Process 1
Process 2
Process n
Process 2
Process n
Process 1
Design Structures

33. Sequence control structure
• The instructions are computed in
sequence i.e. it performs instruction
one after another.
• It uses top-down approach.
Design Structures

34. Example
START
C=a+b
Print c
Read a,b
STOP

35. SELECTION CONTROL STRUCTURE
• It is used for making decisions.
• It allows the program to make a choice
from alternative paths.
• IF …THEN
• IF …THEN… ELSE
• CASE etc.,

36. IF…THEN
Pseudocode Flow chart
IF condition THEN
process 1
.
.
END IF
.
.
If
condition
NO
YES
Process 1

37. Example
Start
Read a
If a>0
Print a is Positive
Stop
no
yes

38. IF…THEN…ELSE
Pseudocode Flowchart
IF condition THEN
process 1
.
.
ELSE
process 2
.
.
END IF
.
.
If
condition
YES NO
Process 1 Process 2

39. Example
Start
Read a,b
If a>b
Print a is Greater
Print b is Greater
Stop
no
yes

40. CASE structure
Pseudocode Flow chart
.
.
CASE Type
Case Type-1:
Process 1
Case Type-2:
Process 2
.
.
Case Type-n:
Process n
.
.
END CASE
Type 1
Type 2
Type 3
Process 1
Process 2
Process 3
no
no
no
yes
yes
yes

41. start
stop
Read m1,m2,m3
Avg=(m1+m2+m3)/3
If
Avg>=60
If
Avg>=50
If
Avg>=35
Fail
Print
First Class
Print
Second Class
Print
Third Class
Example: Finding the Grade

42. Looping control structure
• It is used to execute some instructions
several time based on some condition.
• WHILE loop
• Do…WHILE loop etc.,

43. WHILE Loop
Pseudocode Flow chart
.
.
WHILE condition
.
.
Body of the loop
.
.
END WHILE
Body of The loop
condition
no
yes

44. Example
Start
Num=0
Num=Num+1
Print Num
while
Num<5
stop
no
yes

45. DO…WHILE Loop
Pseudocode Flow chart
DO
.
.
Body of the loop
.
.
WHILE condition
.
.
END WHILE
Body of The loop
condition
no
yes

46. Example
Start
Num=0
Num=Num+1
Print Num
while
Num<5
stop
no
yes

47. Example: Finding the area of a circle
Algorithm
Step1: Start
Step2: Read the value of r
Step3: Calculate area = 3.14*r*r
Step4: Print area
Step5: Stop

48. Pseudocode
Set area
READ the r
COMPUTE area=3.14*r*r
PRINT area
stop

49. Flowchart
START
area=3.14*r*r
Print area
Read r
STOP

50. Find the largest among three Numbers
Algorithm
Step1: Start
Step2: Read the value of a, b, c
Step3: IF (a>b) and (a>c) THEN
print a is largest
ELSE IF (b>c) THEN
print b is largest
ELSE
print c is largest
Step4: Stop

51. Pseudocode
READ a, b, c
IF (a>b) and (a>c) THEN
WRITE a is largest
ELSE IF (b>c) THEN
WRITE b is largest
ELSE
WRITE c is largest
ENDIF
stop

52. Flowchart
START
Print b
Is largest
Read a,b,c
stop
If
(a>b) and
(a>c)
If
b>c
Print a
Is largest
Print c
Is largest
no
yes
yes
no

54. Finding roots of the Quadratic equation
Step:1 Start
Step:2 Enter the values of a,b,c
Step:3 Find the value of D Using the Formula,
D = b*b-4*a*c
Step:4 If D is greater than or equal to zero find 2
roots
root1(-b+sqrt(D))/(2*a)
root2(-b-sqrt(D))/(2*a)
Step:5 Print root1 & root2
Step:6 If D is less than zero, then print the roots
are imaginary
Step:7 Stop

55. Pseudocode
Set root1,root2
READ the value of a, b, c
Find D b*b-4*a*c
IF D>=0 THEN
calculate root1=(-b+sqrt(D))/(2*a)
root2=(-b-sqrt(D))/(2*a)
ELSE
Roots are imaginary
END IF
WRITE root1,root2
Stop

56. Flow chart
Start
Stop
D=b*b-4*a*c
Root1=[-b+sqrt(D)]/(2*a)
Root2=[-b+sqrt(D)]/(2*a)
Read a,b,c
Print root1,root2
If D>=0
no
yes
Print
roots are imaginary

58. Swapping two variables
Algorithm
Step1: Start
Step2: Read the value of a, b
Step3: c = a
a = b
b = c
Step4: Print the value of a and b
Step5: Stop

59. Pseudocode
READ the value of a, b
To swap use
c = a
a = b
b = c
WRITE a, b
stop

60. Flowchart
START
c = a
a = b
b = c
Print a, b
Read a, b
STOP

61. Swapping two variables without using
another variable
Algorithm
Step1: Start
Step2: Read the value of a, b
Step3: a = a + b
b = a - b
a = a - b
Step4: Print the value of a and b
Step5: Stop

62. Pseudocode
READ the value of a, b
To swap use
a = a + b
b = a - b
a = a - b
WRITE a, b
stop

63. Flowchart
START
a = a + b
b = a - b
a = a - b
Print a, b
Read a, b
STOP

64. Finding the year is leap year or not
Algorithm
Step1: Start
Step2: Read the value of year
Step3: IF year % 4 ==0 THEN
print It is a Leap year
ELSE
print It is not a Leap year
Step4: Stop

65. Pseudocode
READ year
IF year % 4 ==0 THEN
WRITE It is a Leap year
ELSE
WRITE It is not a Leap year
ENDIF
stop

66. Flowchart
Start
Read year
year % 4 ==0
Print It is
a Leap year Print It is not a
Leap year
Stop
no
yes

67. Finding the Factorial
Algorithm
Step1: Start
Step2: Read the value of n and set i =1
Step3: While i <= n do
fact =fact * i
i = i + 1
else Goto step5
Step4: Goto step 3
Step5: print the value of fact
Step6: Stop

68. Pseudocode
READ the value of n and set i =1
WHILE (i <= n) do
fact =fact * i
i = i + 1
ENDWHILE
Repeat the loop until condition fails
WRITE fact
stop

69. Flowchart
Start
Read n
i = 1
fact=fact * i
i=i+1
Print fact
while
i<=n
stop
no
yes

70. Finding the Sum of the digits
Algorithm
Step1: Start
Step2: Read the value of n and set i = 0, sum = 0
Step3: While n>0 do
r=n%10
sum=sum + r
n=n/10
else Goto step5
Step4: Goto step 3
Step5: print the value of sum
Step6: Stop

71. Pseudocode
READ the value of n and set i =0, sum=0
WHILE (n>0) do
r=n%10
sum=sum + r
n=n/10
ENDWHILE
Repeat the loop until condition fails
WRITE sum
stop

72. Flowchart Start
r = 0,sum=0
r=n%10
sum=sum + r
n=n/10
Print sum
while
n>0
stop
no
yes
Read n

73. Finding the Reverse of a Number
Algorithm
Step1: Start
Step2: Read the value of n and set i = 0, sum = 0
Step3: While n>0 do
r=n%10
sum=sum *10 + r
n=n/10
else Goto step5
Step4: Goto step 3
Step5: print the value of sum
Step6: Stop

74. Pseudocode
READ the value of n and set i =0, sum=0
WHILE (n>0) do
r=n%10
sum=sum *10 + r
n=n/10
ENDWHILE
Repeat the loop until condition fails
WRITE sum
stop

75. Flowchart Start
r = 0,sum=0
r=n%10
sum=sum *10 + r
n=n/10
Print sum
while
n>0
stop
no
yes
Read n

76. Armstrong Number
Example: 153
13 +53 + 33 =153

77. Finding an Armstrong Number
Algorithm
Step1: Start
Step2: Read the value of n and set a = n, sum = 0
Step3: While n>0 do
r=n%10
sum=sum + r*r*r
n=n/10
else Goto step5
Step4: Goto step 3
Step5: If a = sum then
Print Armstrong Number
Else
Print It is Not an Armstrong Number
Endif
Step6: Stop

78. Pseudocode
READ the value of n and set a =n, sum=0
WHILE (n>0) do
r=n%10
sum=sum + r*r*r
n=n/10
ENDWHILE
Repeat the loop until condition fails
IF a=sum THEN
WRITE Armstrong Number
ELSE
WRITE It is not an Armstrong Number
ENDIF
stop

79. Flowchart Start
a = n,sum=0
r=n%10
sum=sum + r*r*r
n=n/10
Print Armstrong No
while
n>0
stop
no
yes
Read n
if
a=sum
Print It is Not an
Armstrong No

80. Fibonacci series
Example:
0 1 1 2 3 5 8 11….

81. Finding the Fibonacci series
Algorithm
Step1: Start
Step2: Read the value of n and set f=0,f1=-1, f2=1
Step3: While (f<n) do
f=f1+f2
f1=f2
f2=f
Print f
else Goto step5
Step4: Goto step 3
Step5: Stop

82. Pseudocode
READ the value of n and set f=0 ,f1=-1, f2=1
WHILE (f<n) do
f=f1+f2
f1=f2
f2=f
WRITE f
ENDWHILE
Repeat the loop until condition fails
stop

83. Flowchart Start
f=0,f1= -1,f2=1
f=f1+f2
f1=f2
f2=f
Print f
while
f<n
stop
no
yes
Read n

84. Conversion of Celsius to Fahrenheit
Algorithm
Step1: Start
Step2: Read the value of Celsius
Step3: Fahrenheit = (1.8* Celsius) + 32
Step4: Print Fahrenheit
Step5: Stop

85. Pseudocode
Set Fahrenheit
READ the Celsius
COMPUTE Fahrenheit = (1.8* Celsius) + 32
PRINT Fahrenheit
stop

86. Flowchart
START
Fahrenheit = (1.8* Celsius) + 32
Print Fahrenheit
Read Celsius
STOP

87. Conversion of Fahrenheit to Celsius
Algorithm
Step1: Start
Step2: Read the value of Fahrenheit
Step3:Calculate Celsius =(Fahrenheit – 32)/1.8
Step4: Print Celsius
Step5: Stop

88. Pseudocode
Set Celsius
READ the Fahrenheit
COMPUTE Celsius =(Fahrenheit – 32)/1.8
PRINT Celsius
stop

89. Flowchart
START
Celsius =(Fahrenheit – 32)/1.8
Print Celsius
Read Fahrenheit
STOP

90. Finding the sum of odd number between 1 to n
Algorithm
Step1: Start
Step2: Read the value of n and set sum=0,i=1
Step3: While (i<=n) do
sum=sum+i
i=i+2
else Goto step5
Step4: Goto step 3
Step5: Print sum
Step6: Stop

91. Pseudocode
READ the value of n and set sum=0,i=1
WHILE (i<=n) do
sum=sum+i
i=i+2
ENDWHILE
Repeat the loop until condition fails
WRITE sum
stop

92. Flowchart Start
sum=0,i=1
sum=sum+i
i=i+2
Print sum
stop
Read n
While i<=n

93. Finding the sum of even number between 1 to n
Algorithm
Step1: Start
Step2: Read the value of n and set sum=0,i=0
Step3: While (i<=n) do
sum=sum+i
i=i+2
else Goto step 5
Step4: Goto step 3
Step5: Print sum
Step6: Stop

94. Pseudocode
READ the value of n and set sum=0,i=0
WHILE (i<=n) do
sum=sum+i
i=i+2
ENDWHILE
Repeat the loop until condition fails
WRITE sum
stop

95. Flowchart Start
sum=0,i=0
sum=sum+i
i=i+2
Print sum
stop
Read n
While i<=n

96. Conversion of Binary number to Decimal
Algorithm
Step1: Start
Step2: Read the value of n and set i = 0, sum = 0
Step3: While n>0 do
r=n%10
sum=sum + r*pow(2,i)
n=n/10
i=i+1
else Goto step5
Step4: Goto step 3
Step5: print the value of sum
Step6: Stop

97. Pseudocode
READ the value of n and set i =0, sum=0
WHILE (n>0) do
r=n%10
sum=sum + r*pow(2,i)
n=n/10
i=i+1
ENDWHILE
Repeat the loop until condition fails
WRITE sum
stop

98. Flowchart Start
sum=0,i=0
Print sum
stop
Read n
While n>0
r=n%10
sum=sum + r*Pow(2,i)
n=n/10
i=i+1

99. Application software
Packages

100. Application software
• Set of programs, which is used to perform
some specific task.
• Example:
• Word processor
• Spreadsheet program
• Database program etc,.

101. MS-Word
• Starting MS-Word
Start  All Programs  Microsoft
Office  Microsoft Office Word

102. • Creating a New Document
File  New (or) ctrl+N
(or) clicking the new button
• Opening a Document
File  Open (or) ctrl+O
(or) clicking the open button

103. • Saving a New Document
File  Save (or) ctrl+S
(or) clicking the save button
• Printing a Document
File  Print (or) ctrl+P
(or) clicking the open button

104. • Moving the Text
Ctrl+X
(or) clicking the cut button
• Copying the Text
Ctrl+P
(or) clicking the copy button

105. Find and Replace
• Find & Replace
Edit Find and Replace (or) Ctrl+F

106. Formatting the Document
• Format Menu (Format  Font)
–Font size, type, colour, Subscript,
Superscript, Spacing,Text Effects etc,.
–Bullets and Numberings
–Changing case
–Borders and Shadings etc,.