What is an algorithm in computer science

  

 Algorithm refers to the logic of program, and step-by-step description of how to arrive at the solution of a given problem.Algorithm is not a  computer code.Algorithm are just instruction which gives which give clear data to you idea to write the computer code.

   If we are going to make a program, firstly we have want to write the algorithm and flowchart then only we get correct idea about program.To become a programmer the base is to know about algorithm and flowchart.

Qualities of a good algorithm

• Inputs and output should be defined precisely
• Each steps in algorithm should be clear and Unambigous.
• Algorithm should be most effective among many different 
• different ways to solve a problem.
• An algorithm shouldn't have computer code. Instead, the algorithm should be written in such a way that, it can be used in similar programming language.

 Let's look a simple algorithm to find the sum of x and y

           step 1: start   

           step 2: input x,y

           step 3 :let s=x+y

           step 4: print s

           step 5: stop

Lets look another problem

To find the radius of a circle whose radius is given

      

            step 1: start

            step 2: read r

            step 3:let A =3.14*r^2

            step 4: print A 

            step 5: stop   

Find the area of triangle

            step 1: start

            step 2: read b,h

            step 3:let A =1/2*b*h

            step 4: print A 

            step 5: stop      
     

check the given number is odd or even

          step 1: start

          step 2: read x

          step 3:if x mod 2=0,then print''Number is even''else go to step 4.

          step 4: print'' Number is odd '' 

          step 5: stop   

Find the largest among two number

          step 1: start.

          step 2: read x,y.

          step 3:if x>y then print x,''is the largest'' else go to step 4.

          step 4: print y,'' is the largest ''.  
          step 5: stop .