Solved

# array6 challenfge

Posted on 2016-09-15
101 Views
Hi,

I am working on below challenge.
http://codingbat.com/prob/p108997
Psedo code:
1. create new array of the portion of original array length
2. fill new array with rest of the elements
3. check to see if it has 6 if yes return true if no return false
4. retrun above boolean

I wrote my code as below
``````public boolean array6(int[] nums, int index) {
int len=nums.length-index;
int[] num=new int[len];
//fill without using for loop but recursive way
if(num.length==0){
return false;
}
if(num.length==1&&!num.contains(6)){
return false;
}
if(num.length==1&&num.contains(6)){
return true;
}

return null;
}
``````
0
Question by:gudii9
• 3
• 2

LVL 27

Assisted Solution

rrz earned 250 total points
ID: 41800152
Why do you feel the need to create a new array?
You are trying to use a method named contains.  Can you point to it in the API?
0

LVL 33

Accepted Solution

sarabande earned 250 total points
ID: 41800270
since the challenge is to use a recursive approach, you need to

- check if index >= array size
- if yes, return false
- check if nums[index] == 6
- if yes, return true,
- return array6 function call passing nums and index+1
.

if you do so for [3, 5, 6, 0, 4], then the recursive calls are

array6(nums, 0)
array6(nums, 1)
array6(nums, 2) ==> return true

Sara
0

LVL 7

Author Comment

ID: 41804119
java 8 has below lamda for each method but coding bat do not support

public boolean array6(int[] nums, int index) {
IntStream.of(nums).anyMatch(x -> x == 6);
}
0

LVL 7

Author Comment

ID: 41804122
``````public boolean array6(int[] nums, int index) {
if(index>nums.length()){
return false;
}
else if(nums[index]==6){
return true;
}
else return arrays6[nums,index+1];
}

/*- check if index >= array size
- if yes, return false
- check if nums[index] == 6
- if yes, return true,
- return array6 function call passing nums and index+1*/
``````

above gives below error.

Compile problems:

Error:      else return arrays6[nums,index+1];
^
Syntax error on token ",", . expected

see Example Code to help with compile problems
0

LVL 7

Author Comment

ID: 41804124
``````public boolean array6(int[] nums, int index) {
if(index>=nums.length){
return false;
}
else if(nums[index]==6){
return true;
}
else return array6(nums,index+1);
}
``````

above passed all tests.
any improvements or alternate approaches?
0

LVL 27

Expert Comment

ID: 41804138
Your code is good.   My personal preference is to omit the elses.
``````public boolean array6(int[] nums, int index) {
if(index>=nums.length){
return false;
}
if(nums[index]==6){
return true;
}
return array6(nums,index+1);
}
``````
0

## Featured Post

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

### Suggested Solutions

Java functions are among the best things for programmers to work with as Java sites can be very easy to read and prepare. Java especially simplifies many processes in the coding industry as it helps integrate many forms of technology and different d…
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
The viewer will be introduced to the technique of using vectors in C++. The video will cover how to define a vector, store values in the vector and retrieve data from the values stored in the vector.
In this fifth video of the Xpdf series, we discuss and demonstrate the PDFdetach utility, which is able to list and, more importantly, extract attachments that are embedded in PDF files. It does this via a command line interface, making it suitable …