Final answer:
The toInteger function converts a real number into an integer and does not preserve the fractional part; hence, the statement is false.
Step-by-step explanation:
The statement that the toInteger function preserves any fractional part in the returned number is false. The toInteger function, as the name implies, is designed to convert a real number into an integer. In the process of doing so, it will remove or disregard the fractional part of the number. For example, if the function is given 4.56, it will return 4. The exact behavior (whether it rounds, floors, or ceilings the number) may depend on the specific implementation of the toInteger function in a particular programming language, but in all cases, it will not preserve the fractional part.