Do you know, what is Fibonacci numbers..?
These are numbers like 0, 1,1,2,3,5,8,13,21. . . . . . . . . .
How do you get these numbers . .?
First take numbers 0 and 1 as static. (Now numbers are 0, 1)
Last element is 1; its left element is 0, so add them, 0 + 1 = 1 (Now numbers is 0, 1, and 1)
Last element is 1, its left element is 1, so add them, 1 + 1 = 2 (Now numbers are: 0, 1, 1, and 2)
Last element is 2, its left element is 1, so add them, 2 + 1 = 3 (Now numbers are: 0, 1, 1, 2, and 3)
Last element is 3, its left element is 2, so add them, 3 + 2 = 5 (Now numbers are: 0, 1, 1, 2, 3, and 5)
Last element is 5, its left element is 3, so add them, 5 + 3 = 8 (Now numbers are: 0, 1, 1, 2, 3, 5, and 8)
– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
Now let’s write a java program to print Fibonacci numbers up to a limit:
(Learn how to Compile and Run a Java file)
import java.io.*;
class fibonacci
{
long f1=0;
long f2=1;
long f3=0;
int n;
void get() throws IOException
{
BufferedReader Br = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter a limit : ");
n=Integer.parseInt(Br.readLine());
}
void display()
{
for(int i=0;i<n;i++)
{
if(f3 <= n)
{
System.out.println(f3);
f1=f2;
f2=f3;
f3=f1+f2;
}
}
}
public static void main(String p[]) throws IOException
{
fibonacci f = new fibonacci();
f.get();
f.display();
}
}
Output
Java program to print “N” Fibonacci numbers:
import java.io.*;
class fibonacci
{
long f1=0;
long f2=1;
long f3=0;
int n;
void get() throws IOException
{
BufferedReader Br = new BufferedReader(new InputStreamReader(System.in));
System.out.print("How many numbers : ");
n=Integer.parseInt(Br.readLine());
}
void display()
{
for(int i=0;i<n;i++)
{
System.out.println(f3);
f1=f2;
f2=f3;
f3=f1+f2;
}
}
public static void main(String p[]) throws IOException
{
fibonacci f = new fibonacci();
f.get();
f.display();
}
}
Output
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