updated

added comments and changed variable names for better understanding

Misc/FibToN.java

@@ -3,18 +3,21 @@ import java.util.Scanner;
 public class FibToN {
 
 	public static void main(String[] args) {
+		//take input
 		Scanner scn = new Scanner(System.in);
+		int N = scn.nextInt();
+		// print fibonacci sequence less than N
+		int first = 0, second = 1;
+		//first fibo and second fibonacci are 0 and 1 respectively
 		
-		int n = scn.nextInt();
-		
-		int fn = 0, sn = 1;
-		
-		while(fn <= n){
-			System.out.println(fn);
+		while(first <= N){
+			//print first fibo 0 then add second fibo into it while updating second as well
 			
-			int next = fn + sn;
-			fn = sn;
-			sn = next;
+			System.out.println(first);
+			
+			int next = first+ second;
+			first = second;
+			second = next;
 		}
 	}