I am not able to understand it please help https://www.sololearn.com/learn/Java/2208/

Question

I am at beginning of java learning and I am stuck here please help me tell me what is it please help

https://www.sololearn.com/learn/Java/2208/

Answer 1

The for-loop iterates over all the array elements. So the first time it takes intArr[0], which is the first element (6). The sum variable is initialised at 0 and every time the loop runs sum is updated.

sum += intArr[x] means
sum = sum + intArr[x].
In this case the x starts at 0 and ends at 3. Because 4 is equal to intArr.length and not smaller.

So for the sum you get the following steps:

initialize: sum = 0
first loop: sum = 0 + 6 = 6
second loop: sum = 6 + 42 = 48
third loop: sum = 48 + 3 = 51
fourth loop: sum = 51 + 7 = 58

Then loop terminates and thus is the value of sum 58.

Answer 2

Hi, I added some comments to explain what's happening:

// create an array which contains
// the integers 6, 42, 3, 7
int [ ] myArr = {6, 42, 3, 7};

int sum=0;

// loop through the array, starting
// from index 0 (first element in
// the array)
for(int x=0; x<myArr.length; x++) {

// each element of the array is
// accessed by it's index: index
// 0 points to 6, index 1 points
// to 42 and so on.
// sum += 6 does the same as
// sum=sum+6
sum += myArr[x];
}
System.out.println(sum);

If you have any further questions, just ask :)

Answer 3

thanks to all