Question

public static boolean isArithmetic(java.lang.String text)

Given a string of text containing numbers separated by commas, returns true if the numbers form an arithmetic sequence (a sequence in which each value differs from the previous one by a fixed amount). For example,

• given "2,4,6,8", the method returns true
• given "-2,5,12,19,26", returns true
• given "2,4,7", returns false
• given "1,2,23skidoo", returns false

The method should return true for any string containing two or fewer numbers and false for any invalid string. Assume that the string does not contain whitespace before or after the comma.

Parameters:

text - a string of text containing numbers separated by commas

Returns:

true if each number differs from the previous one by the same amount

Answer 1

method to copy:

// definition of the method.
   public static boolean isArithmetic(
   java.lang.String text)
   {  
       // Declare variables.
       String[] words = text.split(",");
       int[] arr = new int[words.length];
       // Start the for loop
       for (int i = 0; i < words.length; i++)
       {
           // Start the try block
           try
           {
               arr[i] = Integer.parseInt(words[i]);
           }
           catch (Exception e)
           {
               return false;
           }
       }
       // check the condition.
       if (arr.length > 1)
       {
           // declare variable.
           int a = arr[0], d = arr[1] - a;
           // start the for loop.
           for (int i = 2; i < arr.length; i++)
           {
               // check the condition.
               if (arr[i] != arr[i - 1] + d)
               {
                   return false;
               }
           }
           return true;
       }
       // check the condition.
       else if (arr.length == 0)
       {
           return false;
       }
       return true;
   }

Program Screenshot:

public class IsArithmeticTest // definition of the method public static boolean isArithmetic ( java.lang. String text) Declare variables. String[] wordstext.split(", "); int[] arr= new int [words. length); // Start the for loop for (int i- 0 i < words.length: i++) // Start the try block try arr[i] - Integer.parseInt (words [i]): catch (Exception e) return false; // check the condition. if (arr.length > 1) // declare variable. int a -arr[0], d-arr[1] - a; // start the for loop. for (int i- 2: i< arr.length: i++) // check the condition. if (arr[i] i- arr[i - 1] + d) return false; return true; // check the condition. else if (arr.length -0) return false; return true;

start the main function. public static void main (String[i args) System.out.println(isArithmetic("2,4, 6,8")) System.out.println (isArithmetic("-2,5,12,19,26")) System.out.println(isArithmetic("2,4,7")); System.out.println(isArithmetic("1,2,23skidoo"))

Sample Output:

true
true
false
false

Code to Copy:

public class IsArithmeticTest
{
   // definition of the method.
   public static boolean isArithmetic(
   java.lang.String text)
   {  
       // Declare variables.
       String[] words = text.split(",");
       int[] arr = new int[words.length];
       // Start the for loop
       for (int i = 0; i < words.length; i++)
       {
           // Start the try block
           try
           {
               arr[i] = Integer.parseInt(words[i]);
           }
           catch (Exception e)
           {
               return false;
           }
       }
       // check the condition.
       if (arr.length > 1)
       {
           // declare variable.
           int a = arr[0], d = arr[1] - a;
           // start the for loop.
           for (int i = 2; i < arr.length; i++)
           {
               // check the condition.
               if (arr[i] != arr[i - 1] + d)
               {
                   return false;
               }
           }
           return true;
       }
       // check the condition.
       else if (arr.length == 0)
       {
           return false;
       }
       return true;
   }
   // start the main function.
   public static void main(String[] args)
   {
       System.out.println(isArithmetic("2,4,6,8"));
       System.out.println(isArithmetic("-2,5,12,19,26"));
       System.out.println(isArithmetic("2,4,7"));
       System.out.println(isArithmetic("1,2,23skidoo"));

   }
}