p_numbers.java

class p_NumberDemo {
	public static void main(String [] a) {
        {
		System.out.println("10 choose 4 is ");
		System.out.println(new Numbers().choose(10, 4));
		System.out.println("\nGCD of 84, 132 is ");
		System.out.println(new Numbers().gcd(2035616, 64));
        }
	}
}

// The following code contains these legitimage syntax usage:
// - Variable declarations
// - Unary and complicated binary arithmetic operations
// - While loop
class Numbers {
	public int choose(int n, int k) {
		int res;
        int i;
		if (!(n<k)) {
			// n! / (k! (n-k)!)
			i = 1;
			res = +1; // just to test unary +
			while (i <= k) {
				res = res * (n-k+i) / i;
                                i = i + 1;
			}
		} else {
			res = 0;
		}
		return res;
	}

	public int gcd(int a, int b) {
		int tmp;
        int res;
		if (a < b) {
			tmp = a;
			a = b;
			b = tmp;
		} else {
		}
		if (b == 0)
			res = a;
		else if ((a / b) * b != a) {
			res = this.gcd(b, a-b*(a/b));
		} else {
			res = b;
		}
		return res;
	}
}