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Tutorials > C Programming > Functions

Functions

In C, functions are blocks of code that can be executed repeatedly and are used to perform a specific task. Functions can be used to organize and structure your code, make it more readable, and reduce duplication.

Functions in C have the following structure:

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return_type function_name(parameter_list) {
    // function body
}

Where:

  • return_type is the data type of the value returned by the function. If the function doesn't return a value, the return_type should be set to void.
  • function_name is the name of the function and can be any valid C identifier.
  • parameter_list is a list of parameters that are passed to the function when it's called. The parameters are separated by commas and can have data types specified. If the function doesn't take any parameters, the parameter list should be set to void.

Here's an example of a function in C that takes two integer parameters, adds them together, and returns the result:

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int add(int a, int b) {
    return a + b;
}

To call the function, you use its name followed by its parameters within parentheses:

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int result = add(2, 3);

This will set the value of result to 5.

Functions in C can also be used to pass arrays and structures as parameters, as well as to return arrays and structures. Functions can be defined and called from any part of the program, and can be called as many times as needed. This makes functions an essential part of C programming, as they allow you to write reusable and modular code that can be easily tested and maintained.



Next: Arrays and Strings

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