CompTIA ITF+ Practice Test 2025 - Free CompTIA ITF+ Practice Questions and Study Guide

Using a string data type for a postal code is appropriate because postal codes can contain a combination of letters, digits, and even special characters, depending on the country. For example, in Canada, postal codes are alphanumeric (such as K1A 0B1), and in the UK, they also contain letters and numbers in specific formats. Strings effectively store this combination without losing any character types.

Furthermore, postal codes are not used to perform mathematical operations, which makes numeric data types like integers or floats unsuitable. These types would be limiting; integers would disregard any non-numeric characters altogether, and floats are not applicable since postal codes cannot represent fractional values or carry out calculations. A boolean type, representing true or false values, is also inappropriate as it does not conform to the requirements of storing diverse alphanumeric characters inherent in postal codes. Thus, a string is the most suitable and flexible choice for this purpose.