The conditional operator (? :) is a ternary operator (it takes three operands). The conditional operator works as follows:
The first operand is implicitly converted to boolean. It is evaluated and all side effects are completed before continuing.
If the first operand evaluates to true (1), the second operand is evaluated.
If the first operand evaluates to false (0), the third operand is evaluated.
The result of the conditional operator is the result of whichever operand is evaluated — the second or the third. Only one of the last two operands is evaluated in a conditional expression.
(Expression ? Expression : Expression)
> a = 1
> b = 2
> PRINT TO_STR(a > b ? a : b) + " is greater."
2 is greater.