How to write an even or odd program in java?

Question

My instructions are "Write a program that prompts the user for a number, then counts up (a ‘for’ loop) from one to that number and prints whether that loop number is even or odd (which will require an ‘if-else’ structure inside the loop)." So it needs to list: 1 is odd 2 is even 3 is odd...

public class AssmtEvenOrOddJulianP {
public static void main(String[] args) {
  //variable
  int num = 0;

  //input
  System.out.print("\nEnter a number less than 100: ");
  num = Expo.enterInt();

  //output
  for (int i = 1; i <= num; i++)
     if ((num % 2) == 0)
     System.out.print("\n" + i + " Is Even");       
     else if ((num % 2) >= 0)
     System.out.print("\n" + i + " Is Odd");

Right now if I input 3 it will print: 1 is odd 2 is odd 3 is odd

Answer 1

Minor mistake:

You should calculate the remainder of i by 2, not num by 2.

Always wrap for and if/else blocks in curly braces:

for (int i = 1; i <= num; i++) {
    if ((i % 2) == 0) {
        System.out.print("\n" + i + " Is Even");
    } else if ((num % 2) >= 0) {
        System.out.print("\n" + i + " Is Odd");
    }
}

Avoid using redundant parantheses:

for (int i = 1; i <= num; i++) {
    if (i % 2 == 0) {
        System.out.print("\n" + i + " Is Even");
    } else if (num % 2 >= 0) {
        System.out.print("\n" + i + " Is Odd");
    }
}

The else if condition has a minor bug that is "unreachable" right now, but could cause pain in the future

num % 2 >= 0 should be i % 2 < 0 || i % 2 > 0

The else if condition can be simplified to else:

for (int i = 1; i <= num; i++) {
    if (i % 2 == 0) {
        System.out.print("\n" + i + " Is Even");
    } else {
        System.out.print("\n" + i + " Is Odd");
    }
}

Final result:

With some other minor improvements:

public class EvenOdd {
    public static void main(String[] args) {
        // input
        System.out.print("\nEnter a number less than 100: ");

        // variable
        int num = Expo.enterInt();

        System.out.println();

        // output
        for (int i = 1; i <= num; i++) {
            if (i % 2 == 0) {
                System.out.println(i + " Is Even");
            } else {
                System.out.println(i + " Is Odd");
            }
        }
    }
}