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Logical Programs in Java – Fibonacci Series, Prime Numbers
Posted by admin on August 25th, 2008

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Fibonacci Series

This Program generates Fibonnaci Series for a given number of times.

Output: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55

[sourcecode language='java']
public class FibonnaciSeries {

/*
* Generates the Fibonnaci Series
*/
public void generateSeries(int num) {

int f1, f2 = 0, f3 = 1;

System.out.println(”fib(0) = ” + f2);

for (int i = 1; i <= num; i++) {
System.out.println("fib(" + i + ") = " + f3);
f1 = f2;
f2 = f3;
f3 = f1 + f2;
}
}

public static void main(String[] args) {
System.out.println("*****Fibonnaci Series*****");
FibonnaciSeries fb = new FibonnaciSeries();
fb.generateSeries(10);
}

}
[/sourcecode]

Highest Prime Number

Given a number this program generates the highest prime number.

Output: If the input is 25, the highest prime number close to 25 is 23. It prints 23.

[sourcecode language='java']
public class PrimeNumber {

/*
* Given a number, finds the highest prime number.
*/
public static int highestPrime(int n) {
int value = 1;

for (int i = 2; i <= n; i++) {
// System.out.println("n: " + n + " i: " + i + " mod: " + n%i);

if (i == n) {
value = n;
break;
}

if (n % i == 0) {
n--;
}
}
return value;
}

public static void main(String[] args) {
int value = highestPrime(25);
System.out.println("Prime:" + value);
}

}
[/sourcecode]

Triangle Printing

Given a number, this program prints the numbers in the right angle manner.

Output:

1
2 3
4 5 6
7 8 9 10
11 12 13 14

[sourcecode language='java']
public class TrianglePrinting {

/*
* Prints the numbers in the right angle manner.
*/
public static void trianglePrinting(int n) {
int counter = 0, i = 1;
while (i <= n) {
counter++;
for (int j = 0; j < counter; j++) {
if (i > n)
break;
System.out.print(i + ” “);
i++;
}
System.out.println();
}
}

public static void main(String[] args) {
trianglePrinting(14);
}

}
[/sourcecode]

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42 Responses to “Logical Programs in Java – Fibonacci Series, Prime Numbers”
  1. rajnish Says: November 21st, 2008 at 10:44 pm

    please send me the java program of “prime number of Fibonacci series”
    let us take e.g.
    0, 1,1,2,3,5,8,13,………..
    den prime number series will be- 3,5,13…………

  2. anil kumar dhatwalia Says: December 22nd, 2008 at 12:02 pm

    amazing coding sir thanx

  3. anil kumar dhatwalia Says: December 22nd, 2008 at 12:07 pm

    please send me th java programe “1 3, 2 4. 5 7, 6 8, 9 11, 10 12;”

  4. sritej Says: January 2nd, 2009 at 1:06 pm

    sir, i want simple logic of prime number programs

  5. shweta Says: January 30th, 2009 at 12:52 pm

    what is fibonacci series

  6. Kiran Says: February 3rd, 2009 at 12:19 pm

    hi, i want a logic program like
    1
    121
    1231
    12341

  7. ramya Says: February 10th, 2009 at 5:10 pm

    please send array using java

  8. shankar Says: February 20th, 2009 at 2:15 pm

    wowwwwwwwwwwwwwwww

  9. nightfox Says: February 27th, 2009 at 8:48 pm

    FibonacciSeries class would never compile , because of the blunders in the code
    Hope u can the see double ‘n’ s used while creating a new instance of the class,
    It becomes a minimal etiquette to check the code (run it in u r machine )
    as many of the newbie’s may take as reference and copy the same code and try to run it
    hope u take this in the +ve manner

  10. Chandra Says: February 28th, 2009 at 7:00 pm

    This is the output generated by the Fibonacci Series Program.
    It is 100% correct. Let me know what is the output u r getting.

    Let’s consider v1= 5, v2 = 10, then v3 = 15 (i.e v1 + v2)
    v4 = 25 (i.e. v3 + v4) there on…..

    Fibonacci Series

    *****Fibonacci Series*****
    fib(0) = 0
    fib(1) = 1
    fib(2) = 1
    fib(3) = 2
    fib(4) = 3
    fib(5) = 5
    fib(6) = 8
    fib(7) = 13
    fib(8) = 21
    fib(9) = 34
    fib(10) = 55

  11. nightfox Says: February 28th, 2009 at 8:42 pm

    Copy the same code that you have pasted ,u will get
    FibonnaciSeries cannot be resolved
    to a type

  12. nightfox Says: February 28th, 2009 at 8:47 pm

    Copy the same code that you have pasted ,u will get
    FibonnaciSeries cannot be resolved to a type error

    because of the spelling mistakes as u r class name is
    FibonacciSeries and u r instantiating a new object with

    FibonnaciSeries fb = new FibonnaciSeries(); (which contains single n and double c’s)
    So i wondered did u ever run in u r machine

  13. Moon Says: March 1st, 2009 at 10:38 am

    Thanks for the correction. The program is updated.

  14. Raja Says: April 29th, 2009 at 8:18 am

    the second program will also be modified to be divided by 3 because if you take 21 as an example if you divide it by 2 it will say its prime number thou its not.. its divided by 3 .. I think we also need to add a if dividing the number with three..

  15. venkat Says: May 28th, 2009 at 2:00 pm

    /* 1 3, 2 4, 5 7, 6 8, 9 11, 10 12 */

    import java.io.*;

    public class oddevenpair {
    public static void main(String a[]) throws Exception{
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    System.out.print(”Enter Number : “);
    int n = Integer.parseInt(br.readLine());
    int odd[] = new int[2];
    int eve[] = new int[2];
    int o = -1, e = -1;
    StringBuffer sb = new StringBuffer();
    for(int i=1; i<=n; i++) {
    if(i%2==0) {
    e++;
    eve[e] = i;
    }
    if(e==1) {
    sb.append(eve[0] + ” ” + eve[1] + “, “);
    e = -1;
    }
    if(i%2!=0) {
    o++;
    odd[o] = i;
    }
    if(o==1) {
    sb.append(odd[0] + ” ” + odd[1] + “, “);
    o = -1;
    }

    }
    System.out.println(sb.delete(sb.length()-2, sb.length()-1).toString());
    }

    }

  16. venkat Says: May 28th, 2009 at 2:16 pm

    /*

    1
    121
    1231
    12341

    */

    import java.io.*;

    public class inseq{
    public static void main(String a[]) throws Exception{
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    System.out.print(”Enter a Number : “);
    int n = Integer.parseInt(br.readLine()); //Read the numeric input from console
    for(int i=0; i<n; i++){
    for(int j=0; j0) {
    System.out.print(1);
    }
    System.out.println(”\n”);
    }
    }
    }

  17. kavitha Says: June 17th, 2009 at 8:28 pm

    please send the programs
    1.display the factor numbers
    2.display the prime number
    3.display the 1 to 25 prime numbers

  18. Nadhiya Says: June 27th, 2009 at 12:05 pm

    send me a fibonaci series program in prime number

  19. Nadhiya Says: June 27th, 2009 at 12:06 pm

    program using fibonacci series in prime number

  20. rohit Says: July 7th, 2009 at 9:06 am

    want a program in java for a pyramid of 5 like:
    1
    1 2
    1 2 3
    1 2 3 4
    1 2 3 4 5

  21. Saurabh Says: July 22nd, 2009 at 9:44 am

    HI i can do all types of pyramid programs !can u print a diamond in java
    1
    1 1
    1 1
    1 1
    1 1
    1 1
    1

  22. Saurabh Says: July 22nd, 2009 at 9:48 am

    /* aprogram to display factors*/
    import java.io.*;

    public class inseq{
    public static void main(String a[]) throws Exception{
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    System.out.print(”Enter a Number : “);
    int n = Integer.parseInt(br.readLine());
    int i,
    for(i=1;i<=n;i++)
    {
    if(n%i==0)
    {
    System.out.print(i);
    }
    }
    }
    }

  23. loucil Says: July 23rd, 2009 at 3:09 pm

    hi, i want a program like this

    12345
    1234
    123
    12
    1

  24. Cristina Says: July 27th, 2009 at 11:20 pm

    Hi, ccan I ask how can I output this:

    25
    1
    20
    15
    3
    10
    4
    5
    5

    Please, I realy need it. Please help me! T.T

  25. indresh Says: August 10th, 2009 at 5:16 am

    input string=acasereeeeeeee
    hi,can i ask how can I output this
    9
    e
    Please, I realy need it. Please help me!

  26. java_cub Says: August 12th, 2009 at 4:28 am

    hi frns, can any one give the code to get the following output

    1
    2 3
    4 5 6
    7 8 9 10
    11 12 13
    14 15
    16

  27. Nels Says: September 13th, 2009 at 1:06 am

    Please send me the java program for Infix to postfix and prefix expression..

  28. saksham Says: September 14th, 2009 at 7:05 am

    input string=acasereeeeeeee
    >input string=acasereeeeeeee
    >hi,can i ask how can I output this
    >9
    >e
    >Please, I realy need it. Please help me!
    see you mean to input a String
    you need to input it.

    //suppose s is String
    int hn=0;
    int c=0;
    int i,j;
    for(i=0;i<s.length();i++)
    {

  29. saksham Says: September 14th, 2009 at 7:15 am

    //remaining part
    char ch=s.charAt(i);
    //search for next now
    for(j=0;j<s.length();j++)
    {
    char chr=s.charAt(j);
    if(ch==chr) c++;

    }
    c–;
    if(h<c){ h=c; //you have to take an
    //int variable and v=i; as
    //i forgot to take v in start.
    }
    }
    System.out.println(s.charAt(v)); //remember v
    System.out.println(h);

  30. saksham Says: September 14th, 2009 at 7:20 am

    “hi frns, can any one give the code to get the following output

    1
    2 3
    4 5 6
    7 8 9 10
    11 12 13
    14 15
    16

    ”

    int c=1;
    int i,j;
    for(i=1;i<=4;i++)
    {
    for(j=1;j=1;i–)
    {
    for(j=1;j<=i;j++)
    {
    System.out.print(c+" ");
    c++;
    }
    System.out.println();
    }

  31. tushar bhakte Says: September 23rd, 2009 at 9:26 am

    i want to always need for this

  32. swapnali Says: October 2nd, 2009 at 11:47 am

    hi,

    i want to knw the logic for permutation of string… in lexicographic order

    like for String abc its permutation shud be
    abc
    acb
    bac
    bca
    cab
    cba

  33. swapnali Says: October 2nd, 2009 at 11:49 am

    hi,
    i want to knw the logic for permutation of string… in lexicographic order
    like for String abc its permutation shud be
    abc
    acb
    bac
    bca
    cab
    cba

  34. Subrat Says: October 20th, 2009 at 11:52 am

    Any one can give me the calculate programming codes without useing conditions,loopig,swith case & Ternary Operator ?

  35. ceejay Says: October 27th, 2009 at 12:12 pm

    can u please help me for the code of this java problem:
    i want to display this 2 3 4
    1+2 +3 +4 =1+4+27+256=288

    thanks

  36. ceejay Says: October 27th, 2009 at 12:13 pm

    can u please help me for the code of this java problem:
    i want to display this factorial
    1+2 +3 +4 =1+4+27+256=288

    thanks

  37. Rajdeep Says: November 2nd, 2009 at 2:33 pm

    SOLUTION:
    1
    1 2
    1 2 3
    1 2 3 4
    ….

    import javax.swing.*;

    public class NumAngle2 {
    public static void main(String[] args) {
    System.out.println(”This program prints numbers in the right angle manner.”);
    String input = JOptionPane.showInputDialog(”Enter number?”);
    int num = Integer.parseInt(input);
    int counter = 1;
    for(int i = 0; i < num; i++) {
    counter++;
    for(int j = 1; j < counter; j++) {
    System.out.print(j + " ");
    }
    System.out.println();
    }
    }
    }

  38. Rajarshi Banerjee Says: November 10th, 2009 at 5:35 am

    Hey guys I am from India and I guarantee you that this Fibonacci number series program will work:-

    import java.io.*;
    class fibonacci
    {
    public static void main(String args[])throws IOException
    {
    BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
    int num,ans1=1,ans2=0,ans3;
    System.out.println(”Enter number”);
    num=Integer.parseInt(br.readLine());
    num=num-2;
    System.out.print(ans2);
    System.out.print(” “);
    System.out.print(ans1);
    System.out.print(” “);
    while(num!=0)
    {
    ans3=ans1+ans2;
    System.out.print(ans3);
    System.out.print(” “);
    ans2=ans1;
    ans1=ans3;
    num=num-1;
    }
    }
    }

  39. Shweta Says: November 16th, 2009 at 2:15 am

    hi friendz
    can anyone give me the code for the prog:
    to accept a string from the user and change the beginning letter of every word with a CAPITAL letter.

  40. Rajdeep Says: November 19th, 2009 at 4:12 am

    /* 1
    1 2 1
    1 2 3 1
    1 2 3 4 1
    */

    import javax.swing.*;

    public class OneAngle {

    public static void main(String[] args) {

    String input = JOptionPane.showInputDialog(”Enter num?”);
    int n = Integer.parseInt(input);

    int count = 0;
    for(int i = 1; i <= n; i++) {
    count++;
    for(int j = 1; j 1) System.out.print(1);
    System.out.println();
    }
    }
    }

  41. sany Says: November 20th, 2009 at 1:20 am

    can you help me how to figure out this java problem.. here is the output..

    ***
    * *
    * *
    * *
    * *
    ***

  42. sany Says: November 20th, 2009 at 1:21 am

    ___***
    __*___*
    _*_____*
    _*_____*
    __*___*
    ___***

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