Fibonacci Series in Java

The first two numbers in a Fibonacci series is always 0 and 1. And each subsequent number is the sum of the previous two numbers. This is a very common series program given in ICSE board.

Below is the program written in Java that displays the Fibonacci series for a desired range:

import java.io.*;
class Fibonacci{
public static void main(String args[])throws IOException{
InputStreamReader isr=new InputStreamReader(System.in);
BufferedReader br=new BufferedReader(isr);
int range, i, f1=0, f2=1, f3;
System.out.print("Enter the range:");
range=Integer.parseInt(br.readLine());
if(range==1)
System.out.println(f1);
else if(range==2)
System.out.println(f1+"\t"+f2);
else if(range>2){
System.out.print(f1+"\t"+f2);
for(i=3;i<=range;i++){
f3=f1+f2;
System.out.print("\t"+f3);
f1=f2;
f2=f3;
}
System.out.println();
}
else
System.out.println("Range should be positive.");
}
}