Why the first elements prints as 0 - Java Arrays

Question

Hello all,

Trying to figure out why the output starts with 0? The code below prints [0, 7, 14, 21, 28], but what I'm trying to achieve should print/return [7, 14, 21, 28, 35]

Here is my code:
import java.util.*;
public class MyClass {
public static void main(String args[]) {
int num = 7;
int length = 5;
int [] numbers = new int [length];

for (int i = 0; i < length; i++){
numbers[i] = num * i;
} System.out.print(Arrays.toString(numbers));
}
}
Thanks for reading! : )

Answer 1

GG128 that's because you multiply by 0 like in you store 7 in num variable and i variable is start with 0, when you run the loop then your condition inside is:-
num*i that means 7*0=0 like that and when you use array then we should always put 0 in for loop because array index start with 0

Answer 2

At first index :
number[0] = 7 * 0 = 0
That's why.!
you can do number[i] = num * ( i+1 ) ;

Answer 3

Thank you both for your quick response. I actually tried number[i] = num * i+1 , but I was getting [1, 8, 15, 22, 29]. Putting the parenthesis for i+1 worked! : )