C How to Program (8th Edition)
8th Edition
ISBN: 9780133976892
Author: Paul J. Deitel, Harvey Deitel
Publisher: PEARSON
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Textbook Question
Chapter 16, Problem 16.5E
(Function Prototypes and Definitions) Explain the difference between a function prototype and a function definition.
Expert Solution & Answer
Program Plan Intro
To explain the difference between function prototype and function definition.
Explanation of Solution
Explanation:
Function prototype | Function definition |
It provides function declaration. | It provides body of the function. |
Data types are mandatory, name of arguments passed are optional | Name of argument must be specified along with their data types. |
Always terminates with semicolon. | Doesn’t contain a semicolon at the end |
It informs the compiler that the function is present in the program. | It contains the code that defines the purpose of the function. |
Example:
void sum(int, int); | Example:
Void sum ( int a, int b) { Statement. } |
Function prototype:
- To declare a function, the prototype function is used.
- It does not include the function's core, only tells the compiler about the name and return type of the function.
- It states, if any, the list of the passed arguments along with their data types.
- The compiler utilizes prototype details to guarantee the appropriate function description and correctness of the data types of arguments.
- The name of the arguments is discretionary in a function prototype; however, description of its data types is mandatory.
- It always ends with a semicolon, unlike a function description that does not end with a semicolon.
Function definition:
- The function definition gives the genuine code that is executed by the compiler.
- In the function definition the intended purpose for which the function has been developed is defined.
- Therefore, unlike a function declaration, a function definition provides the function body together with a header which is the code that makes up the function.
- On the off chance that we have a function definition in the program without a function prototype then the compiler will produce an error message.
- The function header doesn't contain a semicolon in function definition.
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