Final answer:
The claim that a single scanf function call can display a message and accept input is false; the printf function is used to display messages, and the scanf function to accept input.
Step-by-step explanation:
The statement that a single scanf function call can be used to display a message to the user and accept input from the user is false. The scanf function in C programming is used to read formatted input from the standard input (usually the keyboard). To display a message to the user, you would typically use the printf function before the scanf call to prompt the user. Therefore, you need to use both the printf and scanf functions in sequence to accomplish both tasks.