Functions in C Programming

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Example 1: Calculate Sum

Example 2: Tic Tac Toe

Functions and Modular Programming

https://jennychen9827.github.io/CAD281/function.html

Why Use Functions?

Break down complex problems into smaller, manageable pieces and blocks of code that perform specific tasks. They help make code modular, reusable, and easier to maintain.
Avoid code duplication.
Make code more organized and readable.

// Example of a simple function
void printWelcome() {
    printf("Welcome to Tic Tac Toe!\\n");
}

Function Components

Return Type: What the function returns (void, int, char, etc.)
Function Name: Descriptive name of what the function does
Parameters: Input values the function needs
Function Body: The actual code that performs the task

Each function in the example above has a specific purpose, making the code easier to understand and maintain.

1. Function Declaration (Prototype)

Component	Description	Example
Return Type	What the function returns	int, void, float, etc.
Function Name	Identifier for the function	calculateSum
Parameters	Input variables	(int a, float b)

// Function Declaration Syntax
returnType functionName(parameterType1, parameterType2);

// Example
int calculateSum(int a, int b);
void displayMessage(char* text);
float getAverage(float numbers[], int size);