Fibonacci Series

/* This is a fibonacci series where starting from the third term,
 every term can is the sum of its previous two terms. */

import java.io.*;

class Fibonacci{

public static void main(String args[])throws IOException{

//declare all the variables at the beginning
int n,i,a,b,c,sum;

    BufferedReader br = new BufferedReader( 
                new InputStreamReader(System.in));
    System.out.println("Enter the number of terms : ");
    n=Integer.parseInt(br.readLine());

    //initialize the first two terms
    a=0;
    b=1;

    //set the sum as 0 initially.
    sum=0;

    //add the first two tems to sum
    sum=sum+a+b;

    //Generate fibonacci series by adding a and b and
    //changing them each time the loop runs

    for(i=1;i<=n-2;i++){

        c=a+b;
        sum=sum+c;
        a=b;
        b=c;

        }//end of loop

        System.out.print("Sum = "+sum);

  }//end of main
}//end of class