Page 321 - CA_Blue( J )_Class9
P. 321

default: System.out.println("Wrong Choice");
                                }
                            }
                        }
                 Question 5.                                                                                      [15]
                 Write a program to input a number and print the number is composite number or not.
                   Ans.  import java.util.*;
                        class composite_number
                        {
                            public static void main ()
                            {
                                Scanner sc= new Scanner (System.in);
                                int n,i,count=0;
                                System.out.print("Enter a number: ");
                                n=sc.nextInt();
                                for (i=1; i<=n;i++)
                                {
                                    if(n%i==0)
                                    {
                                        count++;
                                    }
                                }
                                if(count>2)
                                    System.out.println(n+" is Composite Number");
                                else
                                    System.out.println(n+" is not Composite Number");
                            }
                        }
                 Question 6.                                                                                      [15]
                 Write a Java program to input a number and print the first factor of the number apart from 1.
                   Ans.  import java.util.*;
                        class first_factor
                        { public static void main()
                            {
                                Scanner sc= new Scanner(System.in);
                                int n,i;
                                System.out.print("Enter a number: ");
                                n=sc.nextInt();
                                for (i=2; i<=n;i++)
                                {
                                    if(n%i==0)
                                    {
                                        break;
                                    }
                                }
                                System.out.println("First factor of "+n + " is : "+i);
                            }
                        }
                 Question 7.                                                                                      [15]
                 Write a program to input the number of lines and print the following triangle using for loop.
                    $
                    &&
                    $$$
                    &&&&
                    $$$$$

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