Why is it necessary to initiate sum=0;

Question

int [ ] myArr = {6, 42, 3, 7};
int sum=0;
for(int x=0; x<myArr.length; x++) {
sum += myArr[x];
}
System.out.println(sum);

Answer 1

because you cannot say that sum = arr [x] since what I would do is simply save the last value of the array. Variables are not always initialized, although it is a good practice to do it. In your case you want to make a sum of all the elements of the array which if you do it with the uninitialized variable sum × = arr [i] it would throw an exception that will indicate that the variable was not initialized

I hope this help you

Answer 2

Thanks man