if the counter does not increases by 2 in java print out flaw code example

Example 1: how to not allow a user to enter a mark greater than 100 or below 0 in java

int[] cw_Mark = new int[6];
    for (int i = 0; i < cw_Mark.length; i++) {
        if (i >= 0 || i <= 100) {
            System.out.println("Please Enter Your Module " + (i+1) + " Coursework Mark: ");
            cw_Mark[i] = input.nextInt();
        } else {
            System.out.println("Please Enter a Number Between 1 and 100");
        }
    }

Example 2: Write a JavaScript function called “GCD()” that takes the values from “Number 1“and “Number 2” then calculate the greatest common divisor of the two numbers and show the result as alert.

Write a JavaScript function called “GCD()” that takes the values from “Number 1“and “Number 2” then calculate the greatest common divisor of the two numbers and show the result as alert.