Answer:
A
Explanation:
B is a print statement.
C is a function invocation
D is a function declaration
A prototype is actually quite close to a declaration. The semi-colon at the end shows that no implementation will follow. Adding parameter names is allowed but would only be helpful for better understanding.
An example of a function prototype is A. float roi(int, double)
A function prototype simply refers to a declaration of a function that is used to perform type checking on function calls.
The main aim of a function prototype is that it tells the complier about the number of arguments and the required datatypes of a function parameter. An example of a function prototype is float roi(int, double).
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