Loops in Java (Exercise 7)

Java Programming: Programming Question on Loops in Java Programming
Topics Discussed:
1. Writing a program that reads an integer n and displays the nth Fibonacci number.

Music:
Axol x Alex Skrindo - You [NCS Release]

#JavaByNeso #JavaProgramming #Loops #Fibonnacci

[kostavsheoran]

these exercises are very helpful in learning how to use the loops and variables, thanks for adding them !

[blackpanda]

you can also change result to be =1 and if the for loop will not be ecsecuted (n=1 ||n=2) that it will print 1

[hikmathasanov]

Here is my solution:

Scanner s = new Scanner(System.in);
System.out.print("enter a number: ");
int n = s.nextInt();

if (n == 1 || n == 2)
System.out.println("Fibonaccy number is 1");

else {
int Result1 = 0;
int Result2 = 1;
int Result3 = 1;

for(int i = 2; i < n ; i++) {
Result1 = Result2;
Result2 = Result3;
Result3 = Result1 + Result2;
}
System.out.println("Fibonacci number is " + Result3);
}

[thivagarmurugan]

public static void main(String args[]) {

Scanner num = new Scanner(System.in);
int a = 0, b = 1, c = 0;
int n = num.nextInt();
for (int i = 2; i < n; i++) {
c = a + b;
a = b;
b = c;

}
System.out.println(c);

}
}

[boooost]

Awesome videos man I love Neso Academy <3
BTW I used the long data type for the result, v1, and v2 variables to get the larger fibonacci numbers (e.g. n = 50)

[NakibAkash]

The explanation is too good. But I have a question in many books fibonacci series is 0, 1, 1, 2, 3, 5, .... But in your example it is starting from 1 and it has a missing element which is 0. For 0 the serial of finding fibonacci nth number is different from yours.Any explanation for that please?

[khushiagarwal]

The problem that was happening in this example can also be solved if we simply print v2 instead of printing the result.

[chiragbudhiraja]

sir the Syllabus covered is not complete.
kindly update it fast if possible

[theripper]

i've done it with a nested for loop. it looks messier but it doesn't have the problem with 1'st and 2'nd fib. numbers

Scanner scan = new Scanner(System.in);
System.out.print("Enter n'th fibbonacci number:");
int nth = scan.nextInt();
int fibo = 1;
int fibo1 = 1;
for (int i = 0; i <= nth; i++) {
fibo=fibo1 - fibo;
for (int j = i; j==i; j++)
fibo1 += fibo;

}
scan.close();
" + fibo);

[jeevithaswamy]

Sir, your explanation is good.When I executed the same program it is printing all the series upto to the entered number.What to do to print the only nth fibonocci number?

[Bibingka]

import java.util.Scanner;

public class Main {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);

System.out.print("enter a message: ");

int input = s.nextInt();

int value = 1;
int value2 = 1;
int result = 0;

for (int i = 2 ; i < input ; i++) {
result = value + value2;
value = value2;
value2 = result;
}
System.out.print(result);
}
}

[madasmsm]

public class Main {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("Enter a Number: ");
int n = s.nextInt();
int i; int fb1 = 1; int fb2 = 1; int sum;
for(i = 2; i < n ; i += 1) {
sum = fb1 + fb2;
fb1 = fb2;
fb2 = sum;
}
System.out.println("FB Number of your input " + n + " Is: " + fb2);
}
}

[_W.S_CEO]

Kinda different way:

Scanner input = new Scanner(System.in);
System.out.print("Tell me your number: ");

int n = input.nextInt(), a=0, b=1, result=0;

for (int i=1; i != n ; i++){
result = a + b ;
a = b;
b = result;


}
System.out.println("Number in the position " +n+ " of the Fibonacci is: " +result);

[elqbano]

The variable has to be declared as long.

[HOPE_-lomz]

int a=1, b=0, c=0;
for(int i=1;i<=n;i++)
{
b=a;
a=c;
c=a+b;
}
System.out.println(c+" ");

[gakobako]

import java.util.Scanner;
public class LoopsEx7 {
public static void main(String[] args) {

Scanner x = new Scanner(System.in);
int n = x.nextInt();
int a = 1, b = 1, c = 0;
if (n == 1||n == 2) {
System.out.println("1");
}else
for (int i = 3;i <= n;i++) {
c = a+b;
a = b;
b = c;
}
System.out.println(c);
}
}

[wasimpatel]

import java.util.*;
public class Fibonacci{
static int a=1;
static int b=1;
static int c=0;

public static void main(String[] args){
Scanner sc =new Scanner(System.in);
System.out.println("enter a nth number of fibonacci series to find nth term");
int n=sc.nextInt();
if(n==1||n==2){
System.out.println(c=1);
}
for(int i=1;i<=n-2;i++){
c=a+b;
a=b;
b=c;
}
System.out.println(n+"th term of fibbonaci is :"+c);
}
}

[JimmyRamokgopa]

Great video. I initialized the sum and the "V1" (named "prev" in my code) to be zero. And I did not have a problem with the first and second fibonacci values.
My code:

import java.util.Scanner;

class Exercise7 {

public static void main(String[] args) {

Scanner s = new Scanner(System.in);
System.out.print("Enter nth value: ");

int n = s.nextInt();
int sum=0;
int prev=0;
int next=1;

for (int i=1; i<=n; i++) {

prev=next;
next=sum;

sum = prev + next;
}
System.out.print("The nth fibonacci value is: " + sum);
}


}

[caesaaar]

import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner input = new Scanner(System.in); //program displays the nth number of the Fibonacci sequence int a, b, n; a = b = 1; int sum = 0; System.out.print("Enter n: "); n = input.nextInt(); System.out.println("Fibonacci sequence: "); System.out.print("1 1 "); for(int i = 1; i <= n - 2; i++){ sum = a + b; System.out.print(sum + " "); a = b; b = sum; } System.out.println(); System.out.println("The n number of the Fibonacci sequence: " + b); } }

[Anurag_Mishra]

I think fibonacci series starts with 0
i.e.