Can't understand why this small segment of code won't work

Question

    int[] binArray = new int[100];
    int bins = 10; 
    int numOfIterations = 100/bins;
    int binElement = 0;
    for (int i=0; i<numOfIterations; i++) {
        binElement = binElement + bins;
        binElement = binArray[i];
        System.out.println(binArray[i]);
    }

Keeps printing: 0 0 0 0 0 0 0 0 0 0

Trying to print: 0, 10, 20, 30, 40 ,50, 60, 70, 80, 90, 100

Answer 1

Your problem is a misunderstanding of how to assign a value to an array

/* Commented below is your code with comments of what the code is doing */
//sets bin element to 10.
binElement = binElement + bins;
// binArray[i] is zero (by default), so all you do is set binElement back to zero.
binElement = binArray[i];
// You still have not updated the array so it prints the default int array value of zero.
System.out.println(binArray[i]);

Change your code to the code posted below which correctly assigns values to an array, and your problems are solved :)

int[] binArray = new int[100];
int bins = 10; 
int numOfIterations = 100/bins;
int binElement = 0;
for (int i=0; i<numOfIterations; i++) {
    binElement = binElement + bins;
    binArray[i] = binElement ;
    System.out.println(binArray[i]);
}

Take a look at the link posted below for plenty of examples on how to assign values to an array.

Arrays

Answer 2

Because binArray is initialized to 0, and you are never writing anything to it.

Flip this line: binElement = binArray[i]; to say this: binArray[i] = binElement; and it will work.

Answer 3

You have to assign values to elements of binArray . Do this within the for loop:

binElement[i] = binElement;

not this

binElement = binElement[i];

Answer 4

Change binElement = binElement[i] to binElement[i] = binElement; Also change the bins value to 0. Then only it will print 0,10.. like this. Otherwise it will print 10,20,... like this.

int[] binArray = new int[100];
int bins = 10; 
int numOfIterations = 100/bins;
int binElement = 0;
bins = 0;  // To print from 0
for (int i=0; i<numOfIterations; i++) {
    binElement = binElement + bins;
    binArray[i] = binElement ;
    System.out.println(binArray[i]);
}