Function used in C programming Types of Function User defined function

1. FUNCTIONS In C-Programming

2. FUNCTIONS
A function in C is a block of code that performs a specific task. Instead of
writing the same code multiple times, a function allows code reuse and
improves readability.

3. SYNTAX OF A FUNCTION
• return_type The data type of the value the function returns. Use void if the function
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does not return anything.
• function_name The identifier used to call the function.
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• parameters (arguments) Values passed to the function (optional).
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• function body The set of instructions the function executes.
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• return statement Returns a value (optional, required if return type is not void).
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4. FUNCTIONS
A function in C is a block of code that performs a specific task. Instead of
writing the same code multiple times, a function allows code reuse and
improves readability.

5. TYPES OF FUNCTIONS
In C, functions are essential for structuring programs. They are
categorized into:
• System-defined (predefined) functions
• User-defined functions

6. SYSTEM-DEFINED FUNCTIONS
System-defined functions are built-in functions provided by C's
standard libraries. They perform common tasks such as input/output
operations, mathematical calculations, string handling, etc.
These functions require the inclusion of the relevant header file before use.

7. EXAMPLE