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ALGORITHM
1. What is a computer ?
Ans: Computer is an electronic device. It accepts
data as input, process the data and displays the
result as output.
2. What is Data?
Ans: Data includes facts, figures , symbols and letters . Which we
give from the keyboard
3. What is an algorithm?
Ans: An algorithm is a well defined set of steps followed in a sequence
provide of specific problem.
4. What are the Characters of an algorithm?
Ans: 1. An algorithm should have zero or more input
2. An algorithm should exhibit atleast one output
3. An algorithm should be finite means if executed it should be
finished in finite number of steps.
4. An algorithm should be defined clearly
5. An algorithm should be basic and easy to perform.
5. What is the use of an algorithm
Ans: An algorithm can be used in many ways it can be used in natural
language like english or graphical tool flow chart but they work well only
if the algorithm is small and simple.
Examples:
Example1: Adding of two numbers
Step1: Start
Step2: Take two values a,b
Step3: Add a+b
Step4: Store the value in c
Step5: print c
Step6: end
Example2: Subtraction of two numbers
Step1: Start
Step2: Take two values a,b
Step 3: Subtract a-b
Step4: Store the value in c
Step5: print c
Step6: End
Example3: Adding of three numbers
Step1: Start
Step2: Take three values a,b,C
Step 3: Add a+b+c
Step4: Store the value in D
Step5: print D
Step6: End
Example4: Find the greatest number between two numbers
Step1: Start
Step2: Take two values a,b
Step 3: a>b
Step4: a is the greatest number
Step5: print a
Step6: Else
Step7: b is greatest number
Step8: Print b
step9:end
Example5: Find the greatest number among three numbers
Step1: Start
Step2: Take three values a,b and c
Step3: a>c, a>b
Step4: a is the greatest number
Step5: Print a
Step 6: Else
Step7: b>a,b>c
Step8: b is the greatest number
Step9:print b
Step 10: else
Step11: c>a, c>b
Step12: c is the greatest number
Step13: print c
Step14: End
Example 6: Find the area of rectangle
Step1: Start
Step2: Take two values l,b
Step3: Multiply lxb
Step4: Store value ‘a’
Step5: Print ‘a’
Step6: End
Example 7: Find the circumference of circle
Step1: Start
Step2: Take three values 2 , π, r
Step3: Multiply 2X II XR
Step4: Store the value c
Step5: Print c
Step6: End
Example 8: Find the area of triangle
Step1: Start
Step2: Take two values b , h
Step3: Multiply 1/2xbxh
Step4: Store the value ‘a’
Step5: print a
Step6: end
FLOW CHART
1. Define Flow chart?
Ans:A graphical toolfor representing the defined solution of a problem .It uses
different symbols to represent different terminology.
2. What is the use of terminal symbol in flow chart
Ans: It is first and last symbol in the flowchart. It is a symbol used to
indicate starting and ending of a program flow ,indicated with
oval shape
3. What is the use of Input/Output symbol in flowchart
Ans: I/O symbol used to denote input/ output function of any input/output
devices. It indicated with parallelogram symbol
4.What is the use of process symbol in flowchart?
Ans: It is used to process the given data, which indicated rectangle shape
5. What is the use of decision symbol in flowchart?
Ans: The diamond symbol used for decision making operations like <,>
< =, > =, AND ,OR ,NOT etc
6. What is the use of Flow direction symbol in flowchart
Ans: Arrow symbols indicates the flow of the entire program
7. What is the use of connector symbol in flow chart
Ans: Circle is used to represent the link between parts of flowchart,
if flowchart is large and unfit in a single page.
Example1: Draw a flowchart for adding two numbers
Example2: Draw a flowchart for finding the largest between two numbers
Example3: Draw a flowchart for finding the greatest among three numbers
CLASS VIII COMPUTERS FLOW CHART AND ALGORITHM
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CLASS VIII COMPUTERS FLOW CHART AND ALGORITHM

  • 1. ALGORITHM 1. What is a computer ? Ans: Computer is an electronic device. It accepts data as input, process the data and displays the result as output. 2. What is Data? Ans: Data includes facts, figures , symbols and letters . Which we give from the keyboard 3. What is an algorithm? Ans: An algorithm is a well defined set of steps followed in a sequence provide of specific problem. 4. What are the Characters of an algorithm? Ans: 1. An algorithm should have zero or more input 2. An algorithm should exhibit atleast one output 3. An algorithm should be finite means if executed it should be finished in finite number of steps. 4. An algorithm should be defined clearly 5. An algorithm should be basic and easy to perform. 5. What is the use of an algorithm Ans: An algorithm can be used in many ways it can be used in natural language like english or graphical tool flow chart but they work well only if the algorithm is small and simple. Examples: Example1: Adding of two numbers Step1: Start Step2: Take two values a,b Step3: Add a+b Step4: Store the value in c Step5: print c Step6: end
  • 2. Example2: Subtraction of two numbers Step1: Start Step2: Take two values a,b Step 3: Subtract a-b Step4: Store the value in c Step5: print c Step6: End Example3: Adding of three numbers Step1: Start Step2: Take three values a,b,C Step 3: Add a+b+c Step4: Store the value in D Step5: print D Step6: End Example4: Find the greatest number between two numbers Step1: Start Step2: Take two values a,b Step 3: a>b Step4: a is the greatest number Step5: print a Step6: Else Step7: b is greatest number Step8: Print b step9:end Example5: Find the greatest number among three numbers Step1: Start Step2: Take three values a,b and c Step3: a>c, a>b Step4: a is the greatest number Step5: Print a
  • 3. Step 6: Else Step7: b>a,b>c Step8: b is the greatest number Step9:print b Step 10: else Step11: c>a, c>b Step12: c is the greatest number Step13: print c Step14: End Example 6: Find the area of rectangle Step1: Start Step2: Take two values l,b Step3: Multiply lxb Step4: Store value ‘a’ Step5: Print ‘a’ Step6: End Example 7: Find the circumference of circle Step1: Start Step2: Take three values 2 , π, r Step3: Multiply 2X II XR Step4: Store the value c Step5: Print c Step6: End Example 8: Find the area of triangle Step1: Start Step2: Take two values b , h Step3: Multiply 1/2xbxh Step4: Store the value ‘a’ Step5: print a Step6: end
  • 4. FLOW CHART 1. Define Flow chart? Ans:A graphical toolfor representing the defined solution of a problem .It uses different symbols to represent different terminology. 2. What is the use of terminal symbol in flow chart Ans: It is first and last symbol in the flowchart. It is a symbol used to indicate starting and ending of a program flow ,indicated with oval shape
  • 5. 3. What is the use of Input/Output symbol in flowchart Ans: I/O symbol used to denote input/ output function of any input/output devices. It indicated with parallelogram symbol 4.What is the use of process symbol in flowchart? Ans: It is used to process the given data, which indicated rectangle shape 5. What is the use of decision symbol in flowchart? Ans: The diamond symbol used for decision making operations like <,> < =, > =, AND ,OR ,NOT etc 6. What is the use of Flow direction symbol in flowchart Ans: Arrow symbols indicates the flow of the entire program 7. What is the use of connector symbol in flow chart Ans: Circle is used to represent the link between parts of flowchart, if flowchart is large and unfit in a single page. Example1: Draw a flowchart for adding two numbers
  • 6. Example2: Draw a flowchart for finding the largest between two numbers Example3: Draw a flowchart for finding the greatest among three numbers