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Algorithm & Flow Charts

Algorithm & Flow Charts. Presented By Manesh T Course:1090 CS. ALGORITHMS AND FLOWCHARTS. Algorithm Step by step method to solve a problem is algorithm Flow Chart Diagrammatic representation of algorithm. Algorithm. Example 1: Write an algorithm to Add two numbers.

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Algorithm & Flow Charts

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  1. Algorithm & Flow Charts Presented ByManesh TCourse:1090 CS

  2. ALGORITHMS AND FLOWCHARTS • Algorithm • Step by step method to solve a problem is algorithm • Flow Chart • Diagrammatic representation of algorithm

  3. Algorithm • Example 1: Write an algorithm to Add two numbers

  4. Problem: Add two numbers Step 1: Start Step 2: Read A, B Step 3: C=A+B Step 4: Print C Step 5: Stop

  5. Algorithm Problem: Multiply 2 numbers Problem: Subtract 2 numbers Step 1: Start Step 2: Read A, B Step 3: C=A-B Step 4: Print C Step 5: Stop Step 1: Start Step 2: Read A, B Step 3: C=A*B Step 4: Print C Step 5: Stop

  6. AlgorithmProblem: Average of 3 numbers Step 1: Start Step 2: Read A, B, C Step 3: Avg=(A+B+C)/3 Step 4: Print Avg Step 5: Stop

  7. AlgorithmProblem: Find even or odd Step 1: Start Step 2: Read N Step 3: Is (N%2=0) then Print “Even” else Print “Odd” Step 4: Stop

  8. AlgorithmProblem: Find Pass or Fail • Detailed Algorithm • Step 1: Start • Step 2: Read M1,M2,M3,M4 Step 3: GRADE M1+M2+M3+M4 Step 4: Is (GRADE < 60) then Print “FAIL” else Print “PASS” Step 5: Stop

  9. The Flowchart A Flowchart is another algorithm but graphical. • shows logic solution • emphasizes individual steps and their interconnections • A flowchart must have a start and stop • A steps in a flowchart must connect.

  10. Flowchart Symbols General Used Symbols

  11. Flow Chart: Add Two Numbers Algorithm Start Flowchart Read A, B C=A+B Print C Stop

  12. DECISION STRUCTURES • The expression A>B is a logical expression • it describes a condition we want to test • if A>B is true (if A is greater than B) we take the action on left • print the value of A • if A>B is false (if A is not greater than B) we take the action on right • print the value of B

  13. is A>B Y N DECISION STRUCTURES Print A Print B

  14. Flow Chart: Find Even or Odd Start Read N Is N%2=0 N Y Print “Odd” Print “Even” Stop

  15. Flow Chart: Find Largest of two numbers Start Read A, B Is A>B N Y Print “B is large” Print “A is large” Stop

  16. START Read a, b, c d sqrt(b x b – 4 x a x c) x1(–b + d) / (2 x a) X2 (–b – d) / (2 x a) STOP Problem: Write Algorithm and Flowchart to find solution of Quadratic equation • Algorithm: • Step 1: Start • Step 2: Read a, b, c • Step 3: dsqrt ( ) • Step 4: x1  (–b + d) / (2 x a) • Step 5: x2  (–b – d) / (2 x a) • Step 6: Print x1, x2 • Step 7: Stop Print X1, X2

  17. Assignment 1 Draw algorithm and flowchart • Find area of triangle (area=length*breadth*height) • Convert Celsius to Fahrenheit temperature (C=1/32*(F-32) • Find Area of Circle (area= 3.14*R*R) • Find volume of sphere (4/3* 3.14*R*R*R) • Find area of rectangle (area= length *breadth)

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