ALGORITHM/FLOWCHART/PROBLEMSOLVING/LECTURE-6

Algorithm

Ø  An algorithm is step by step execution of program .

Ø  It is written in simple  English language.

Ø  Easy to understand

Ø  An algorithm is used to understand the logic of program

FEATURES:

Ø  An algorithm must follow a sequence that is one step followed by the another step.

Ø  Decision:  you can use decision statement for taking decisions

Ø  Repetition: you can also use it to reapeat a particular statement

EXAMPLES:

1.       START                                                  

 Read input A&B                         

 C=A+B                         (SUM OF TWO NUMBERS)

 Display C

 END

FLOWCHART

What is flowchart?

A flowchart is the graphical rrepresntation of program. A flowchart is the collection of conventional symbols. These symbols are

Drawbacks

1.       >Time consuming process

2.       >Flowchart of complex is complex

  >No well defined standard

Problem solving

In problem solving process it is necessary to find out the problem & take necessary actions.

In computer programming it is a systematic approach to find the solution of a problem & implement it

There are two techniques to solve a problem

1.       Algorithm

2.       Flowchart

·        Different phases to solve a problem

1.       >Defining the problem: in this phase we define the problem according to our objective

2.       >Analyzing the problem: in this phase all the possibilities for decision making has verified

3.       >Designing a program: algorithm and flowchart of optional solution is to be designed

4.       >Coding a program: syntax is written

5.      >Testing a program: > correctness > reliability

>  Maintaining a program
(for further reference)

HOMEWORK:
       
     write algorithms for the following:

• to calculate sum of three numbers
• to calculate average of three numbers
• to check whether a person is eligible to vote or not 
• to swap 2 numbers (with and without third variable)
• to print largest number among three numbers
• to calculate the roots of the equation
• to check whether a number is even or odd from 100 numbers
• to check the working of repetition statement

                (for solutions click here)