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Thursday, 25 August 2016

Chapter 7 Exercise 30, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

*7.30 (Pattern recognition: consecutive four equal numbers) Write the following method that tests whether the array has four consecutive numbers with the same value. public static boolean isConsecutiveFour(int[] values) Write a test program that prompts the user to enter a series of integers and displays if the series contains four consecutive numbers with the same value. Your program should first prompt the user to enter the input size—i.e., the number of values in the series. Here are sample runs:

Enter the number of values: 8
Enter the values: 3 4 5 5 5 5 4 5
The list has consecutive fours
Enter the number of values: 9
Enter the values: 3 4 5 5 6 5 5 4 5
The list has no consecutive fours 



import java.util.Scanner;
 
 
public class ProgrammingEx7_30 {
 
 public static void main(String[] args) {
  Scanner input = new Scanner(System.in);
  System.out.print("Enter the number of values:");
   
  int[] values = new int[input.nextInt()];
   
  System.out.print("Enter the number of values:");
   
  for (int  i= 0; i < values.length; i++) {
   values[i]= input.nextInt();
  }
   
  if(isConsecutiveFour(values) ) {
   System.out.println("The list has consecutive fours");
  }else {
   System.out.println("The list has no consecutive fours");
  }
    
   
   
   
 }
 
 public static boolean isConsecutiveFour(int[] values) {
 
  int start = values[0];
  int count = 1;
  for (int i = 1; i < values.length; i++) {
   if (start != values[i]) {
    start = values[i];
    count = 1;
   } else {
 
    count++;
   }
    
   if(count == 4) break;
 
  }
 
  if (count == 4)
   return true;
 
  return false;
 
 }
 
}

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