Arithmetic and Geometric Sequence

Arithmetic Sequence

The program generates arithmetic sequence of K items.  on executing the program, user asked to the following input values  a (start value) , d (common difference) and K (number of elements in the sequence) to generate the sequence. 

 a - starting value
 d - common difference

import java.util.Scanner;

public class ArithSequence {

 public static void main(String[] args) {
  // TODO Auto-generated method stub
  
 System.out.println("Generate Arithmetic Sequence n");  
 Scanner sc = new Scanner(System.in);
  
 System.out.println( "starting value for a ");
 int a = sc.nextInt();
  
 System.out.println( "Enter common deference for d ");
 int d = sc.nextInt();
  
 System.out.println( "Enter K items in sequence");
 int K = sc.nextInt();
 sc.close();  
  
 System.out.println("nSequence ");  
 int s=0;
 for(int n=0; n < K ; n++ )  
   { 
  s = n*d + a;  
  System.out.print( s + ", ");            
   }
   
    }

}

Output

Generate Arithmetic Sequence 

starting value for a 
2
Enter common deference for d 
2
Enter K items in sequence
10

Sequence 
2, 4, 6, 8, 10, 12, 14, 16, 18, 20 

Geometric Sequence

The program generates Geometric sequence of K items.  on executing the program, user asked to the following input values  a (start value) , r (common ratio ) and K (number of elements in the sequence) to generate the sequence. 

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Scanner;

public class GeometSequence {

   public static void main(String[] args) 
   {  
  
     System.out.println("Print Geometric Sequence n");  
     Scanner sc = new Scanner(System.in);
  
     System.out.println( "Enter first item(integer) in sequence ");
     int a = sc.nextInt();
  
     System.out.println("Enter value for a (firstitem) in sequence");
     int cr = sc.nextInt();
  
 System.out.println("Enter K items in sequence");
 int K = sc.nextInt();
 sc.close();
     
 System.out.println("n Sequence  ");    
 for( int n=0; n<K ; n++ ) 
 {
  int s = a* (int)Math.pow(cr, n) ;
  System.out.print(s+" , ");    
 }
  
    
   }

}

Output

Print Geometric Sequence 

Enter value for a (first item) in sequence 
2
Enter common ratio r of the sequence 
3
Enter K items in sequence
10

Sequence
2 , 6 , 18 , 54 , 162 , 486 , 1458 , 4374 , 13122 , 39366