/* 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