Algorithm

Algorithm

• Algorithm is the step by step method that is used to solve a problem.
• Stages of solving a problem using computer

                    1.Analyzing the problem in terms of input, process and output.

                    2.Developing an algorithm for the problem.

                    3.Writting a computer program.

                    4.Testing the program.

• The method that is used to solve the problem is called "Algorithm"
• An algorithm can be represented in two ways

                     1.Graphically

                     2.Textually

• Flowchart is a graphical representation of the algorithm.
• Pseudo code is a textual representation of the algorithm.
• Pseudo code help for all people could read and understand.

      For example: Design an algorithm for adding three subject marks?

                   Input: 3 subjects marks

                   Processing: Adding marks of  3 subjects

                   Output: Total marks of three marks. 

The components of pseudo code

1. Variables
2. Input/Output
3. Assignment
4. Selection
5. Repetition
 

Variable 

• Variable is used to store information and manipulate in computer program.

 Input/Output  

• Input is a data which is gain from environment.
• Output is a information. (Processed data)  

 Sequence 

• Describe the flow of program.
• Typically executed inorder.

Selection 

• Also called conditional statement.
• Performs true or false test.
• Determines which code to execute next.

                Example: If, Select case, Go to

Repetiton 

• Also called looping structure. 
• Repeats a selection of ports until an exist.

                Example: For next, do while, Do until

 

Selection Statement

 If <condition> Then

       Statement

Else

       Statement

End if