Final answer:
The boolean expression to test if an integer x falls between 0 and 50 is (x > 0) && (x < 50), where && is the logical AND operator ensuring that both conditions of being greater than zero and less than 50 are met.
Step-by-step explanation:
To test if an int x falls between 0 and 50, you would write the following boolean expression:
(x > 0) && (x < 50)
This expression uses the logical AND operator && to ensure that two conditions are met: x must be greater than zero and x must be less than 50. This means that if x is any integer value within that range, the expression will evaluate to true. Otherwise, it will be false.