Alteryx Foundation Micro-Credential Practice Exam

What is the range of the Byte/Int8 datatype?

1. -(2^7) to (2^7) -1

2. 0 to 255

3. -(2^15) to (2^15) -1

4. -(2^31) to (2^31) -1

The correct answer is: -(2^7) to (2^7) -1

The correct choice specifies that the range of the Byte/Int8 datatype is from -(2^7) to (2^7) - 1. The Int8 datatype refers to an 8-bit signed integer, meaning it can represent both positive and negative numbers. In binary, 8 bits can hold values from 0 to 255 if they were unsigned, but when the Int8 is signed, one bit is used to indicate the sign of the number (positive or negative). This change effectively reduces the maximum positive value by half while introducing negative values. Therefore, the correct range is calculated as follows: - The smallest value is -128, which corresponds to -(2^7). - The largest value is 127, which corresponds to (2^7) - 1. This calculation leads us to confirm that the range of an 8-bit signed integer extends from -128 to 127, making the provided answer accurate. The other options relate to different datatypes. The choice stating 0 to 255 applies to an unsigned 8-bit integer (Byte), while the ranges of -(2^15) to (2^15) - 1 and -(2^31) to (2^31) -