Assignment 04.txt

//Task 01
//Task01a
public class Task01a{
     public static void main(String [] args){
          int a=24;
          while(a>=-6){
               if(a==-6){
                    System.out.print(a);
               }
               else{
                    System.out.print(a+",");
               }
               a-=6;
          } 
     }
}

//Task 1b
public class Task01b{
     public static void main(String [] args){
          int b=-10;
          while(b<=20){
               if(b==20){
                    System.out.print(b);
               }
               else{
                    System.out.print(b+",");
               }
               b+=5;
          }
     }
}



//Task 2
import java.util.Scanner;
public class Task02{
     public static void main(String [] args){
          Scanner scnr=new Scanner(System.in);
          System.out.println("Enter the value of N-");
          int N=scnr.nextInt();
          int sum=0;
          for(int a=1;a<=N;a++){
               System.out.println("Enter an input-");
               int input=scnr.nextInt();
               sum+=input;
          }
          System.out.println("The sum of "+N+" numbers is "+sum);
          System.out.println("The average is "+(sum/N));
     }
}



//Task 3
import java.util.Scanner;
public class Task03{
     public static void main(String [] args){
          Scanner scnr=new Scanner(System.in);
          while(true){
               System.out.println("Enter a number");
               int num=scnr.nextInt();
               if(num<0){System.out.println("Invalid input");
                    break;
               }
               System.out.println(num+"^"+2+"="+(num*num));
          }
     }
}



//Task 4
import java.util.Scanner;
public class Task04{
     public static void main(String [] args){
          Scanner scnr=new Scanner(System.in);
          System.out.println("Enter a number-");
          int N=scnr.nextInt(),i=1;
          System.out.println("Divisors of "+N+":");
          while(i<=N){
               if(N%i==0){
                    System.out.println(i);
               }
               i++;
          }
     }
}          



//Task 5
import java.util.Scanner;
public class Task05{
     public static void main(String [] args){
          Scanner scnr=new Scanner(System.in);
          System.out.println("Enter an integer: ");
          int num=scnr.nextInt(), i=1,input,cnt1=0,cnt2=0;
          while(i<=num){
               System.out.println("Enter number "+i+":");
               input =scnr.nextInt();
               i++;
               if(input>=0){
                    cnt1++;
               }
               if(input<0){
                    cnt2++;
               }
          }
          System.out.println(cnt1+" non-negative numbers");
          System.out.println(cnt2+" negative numbers");
     }
}




//Task 6
import java.util.Scanner;
public class Task06{
     public static void main(String [] args){
          Scanner scnr=new Scanner(System.in);
          System.out.println("Input number of terms : ");
          int n=scnr.nextInt(),i=1,sum=0,num=1;
          System.out.println("The odd numbers are : "); 
          while(i<=n){
               System.out.println(num);
               sum+=num;
               num+=2;
               i++;
          }
          System.out.println("The sum of odd natural numbers up to "+n+" terms is: "+sum);
     }
}



//Task 7
import java.util.Scanner;
public class Task07{
     public static void main(String [] args){
          Scanner scnr=new Scanner(System.in);
          int n,i=1,sum=0;
          while(i<=10){
               System.out.println("Enter number : ");
               n=scnr.nextInt();
               sum+=n;
               System.out.println("Sum = "+sum);
               i++;
          }
     }
}



//Task 8
import java.util.Scanner;
public class Task08{
     public static void main(String [] args){
          Scanner scnr=new Scanner(System.in);
          System.out.println("Enter a number:");
          int n=scnr.nextInt(),i=1;
          while(i<=n){
               if(i%5==0 && i%3!=0){
                    System.out.println(i);
               }
               i++;
          }
     }
}



//Task 9
import java.util.Scanner;
public class Task09{
     public static void main(String [] args){
          Scanner scnr=new Scanner(System.in);
          System.out.println("Enter the value of N-");
          int N=scnr.nextInt(),c=0;
          while(N!=0){
               N=N/10;
               c++;
          }
          System.out.println("Total digits = "+c);
     }
}



//Task 10
import java.util.Scanner;
public class Task10{
     public static void main(String [] args){
          Scanner scnr=new Scanner(System.in);
          System.out.println("Enter the value of N-");
          int N=scnr.nextInt(),c=0,n=N;
          while(N!=0){
               N/=10;
               c++;
          }
          int divisor=(int)Math.pow(10,c-1),digit,last_digit=n%10;
          while(n!=0){
               digit=n/divisor;
               if(n%divisor==0){
                    System.out.print(digit);
               }
               else{
                    System.out.print(digit+",");
               }
               n%=divisor;
               divisor/=10;
          }
     }
}




//Task 11
import java.util.Scanner;
public class Task11{
     public static void main(String [] args){
          Scanner scnr=new Scanner(System.in);
          System.out.println("Please enter a number: ");
//Task 11a          
          int input=scnr.nextInt(),i=1,n1,c=0;          
          while(i<=input){
               n1=input%i;
               if(n1==0){
                    c++;
               }
               i++;
          }
          if(c==2){
               System.out.println(input+" is a prime number");
          }
          else{
               System.out.println(input+" is not a prime number");
          }
//Task 11b         
          int j=1,n2,sum=0;
          while(j<=(input-1)){
               n2=input%j;
               if(n2==0){
                    sum+=j;
               }
               j++;
          }
          if(sum==input){
               System.out.println(input+" is a perfect number");
          }
          else{
               System.out.println(input+" is not a perfect number");
          }
     }
}