ISC and ICSE Board Questions & Answers

Programme List 1-  Write a  program to print the first 15 numbers of the Pell series in JAVA Prgramming Language In mathematics, the Pell numbers are an infinite sequence of integers. The sequence of Pell numbers starts with 0 and 1, and then each Pell number is the sum of twice the previous Pell number and the Pell number before that.: thus, 70 is the companion to 29, and 70 = 2 × 29 + 12 = 58 + 12. The first few terms of the sequence are : 0, 1, 2, 5, 12, 29, 70, 169, 408, 985, 2378, 5741, 13860 2-  Write a programme to check whether a number is a MAGIC number or not?  

Write a  program to print the first 15 numbers of the Pell series in JAVA Prgramming Language In mathematics, the Pell numbers are an infinite sequence of integers. The sequence of Pell numbers starts with 0 and 1, and then each Pell number is the sum of twice the previous Pell number and the Pell number before that.: thus, 70 is the companion to 29, and 70 = 2 × 29 + 12 = 58 + 12. The first few terms of the sequence are : 0, 1, 2, 5, 12, 29, 70, 169, 408, 985, 2378, 5741, 13860,… Solution : import java.util.*; public class pellnumber   {     public static void main(String args[])     { int n,a=1,b=0,c;     System.out.println("First 20 Pell numbers: ");     for(n=1; n<=20; n++)      {       c= a + 2*b;       System.out.print(c+" ");       a = b;       b = c;      }    }  } Back to Programme List

import java.util.*; public class MagicNumberCheck {  public static void main(String args[])  {  Scanner ob=new Scanner(System.in) ;  System.out.println("Enter the number to be checked.");  int n=ob.nextInt();  int sum=0,num=n;  while(num>9)  {  sum=num;int s=0;  while(sum!=0)  {  s=s+(sum%10);  sum=sum/10;  }  num=s;  }  if(num==1)  {  System.out.println(n+" is a Magic Number.");  }  else  {  System.out.println(n+" is not a Magic Number.");  }  } }