Is the character within the specified range?

The code inside the parentheses in Listing 4 tests to determine if the character value stored in temp is greater than or equal to 65 (A) AND is less than or equal to 90 (Z).

In other words, contrary to the test in  the previous program, this code tests to see if the character is within the specified range rather than testing to see if the character is outside the specified range.