Chapter 5: Functions

 Functions are fundamental building blocks in C programming that allow for modular and reusable code. In this chapter, we'll dive into defining and using functions effectively. You'll learn about function prototypes, function arguments, return values, and the concept of scope. With the help of real-world examples, you'll understand how to create functions that enhance the organization and efficiency of your code.

Example:

#include <stdio.h> // Function declaration int add(int a, int b); int main() { int num1 = 5; int num2 = 3; int sum = add(num1, num2); printf("Sum: %d\n", sum); return 0; } // Function definition int add(int a, int b) { return a + b; }

Explanation:

We declare a function prototype for the add() function, specifying its return type and parameters. Inside the main() function, we call the add() function, passing num1 and num2 as arguments, and store the returned sum in the sum variable. The add() function definition defines the behavior of the function. It takes two integers as arguments and returns their sum.

To compile and run the program, follow the same steps as in the previous chapters.

In the next chapter, we'll explore arrays, which allow for storing and manipulating multiple values of the same data type.