Convert Integer to Binary

Write a function that prints out the binary form of an integer. (Write the following function that is built into Java: String s = Integer.toBinaryString(i);)

Example: if num = 35, then print 100011

Iterative Solution

public void printBinaryform(int num) {
    int[] binary = new int[40];
    int index = 0;

    while (num > 0) {
        binary[index++] = num % 2;
        num /= 2;
    }

    for (int i = index-1; i >= 0; i--)
        System.out.print(binary[i]);
}

Recursive Solution

public void printBinaryform(int number) {
    if (number <= 1) {
        System.out.print(number);
        return;
    }

    int remainder = number % 2; 
    printBinaryform(number >> 1);
    System.out.print(remainder);
}