arithmeticSeq.java

// Arithmetic progression

// DESCRIPTION:
// In your class, you have started lessons about arithmetic progression. Since you are also a programmer, you have decided to write a function that will return the first n elements of the sequence with the given common difference d and first element a. Note that the difference may be zero!

// The result should be a string of numbers, separated by comma and space.

// Example
// # first element: 1, difference: 2, how many: 5
// arithmetic_sequence_elements(1, 2, 5) == "1, 3, 5, 7, 9"

import java.util.*;
import java.util.stream.Collectors;

class Progression {
  
  public static String arithmeticSequenceElements(int a, int d, long n) {
    // Solution goes here
     List<String> list = new ArrayList<String>();
       for(int i = a; list.size() < n; i+= d){
         list.add(String.valueOf(i));
       }
    return list.stream().collect(Collectors.joining(", "));
   }
}