/* Rational numbers are builtin */
a: 3 / 11;
3/11

b: 117 / 17;
117/17

a + b;
1338/187

a - b;
-1236/187

a * b;
351/187

a / b;
17/429

a^5;
243/161051

num(a);
3

denom(a);
11

ratnump(a);
true