Algorithm & Flow Charts Presented By Manesh T Course:1090 CS

ALGORITHMS AND FLOWCHARTS 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

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

Algorithm Problem: Subtract 2 numbers Problem: Multiply 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

Algorithm Problem: 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

Algorithm Problem: Find your Age Step 1: Start Step 2: Read Byear Step 3: Age=2015-Byear Step 4: Print Age Step 5: Stop

Algorithm Problem: Area of Circle Step 1: Start Step 2: Read Radius Step 3: Area=3.14*Radius *Radius Step 4: Print Area Step 5: Stop

Algorithm Problem: 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

Algorithm Problem: 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

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.

Flowchart Symbols General Used Symbols

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

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

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

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

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

Problem: Write Algorithm and Flowchart to find solution of Quadratic equation START Read a, b, c d  sqrt(b x b – 4 x a x c) STOP x1 (–b + d) / (2 x a) X2  (–b – d) / (2 x a) 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

Assignment 1 Draw algorithm and flowchart Find area of triangle (area=(1/2)*breadth*height) Convert Celsius to Fahrenheit temperature f = (1.8*c) + 32; Volume of cylinder(V= 3.14*R*R*Height) Find volume of sphere (4/3* 3.14*R*R*R) Find biggest of three numbers.

Instructions to students Study definition well Study different algorithms well Study how to draw flowchart for specific problems. Workout various assignment problems Approach me for any doubt clarifications

Control Statements Decision Making & Branching Decision Making & Looping If Statement Switch ConditionalStatement For loop While loop Do while loop Jump Break Continue Simple If If else Nested if else If else ladder