C Programming Learn To Code – Sisir Kumar Jena

The above example is just an analogy to understand what a function is and how we are going to write it in C code. But, the actual syntax may slightly differ as we will discuss in a later section. After completing this chapter, readers will able to: Write functions for any given problem and describe the need for using a function. Define and differentiate the different categories of functions available in C. Explain the components of a function and how they work.

Know what a recursive function is and how to write one. Know all the different kinds of storage classes available in C. 9.2 The Need for Functions There are several uses of a function. We will take an example to show you why a function is needed. Suppose you are a carpenter and you build different types of wooden furniture. One day you receive an order to cut 10,000 pieces of wood in a zigzag manner, as shown in Figure 9.3.

Assume that no cutting machine has yet been developed to cut a piece of wood in a zigzag pattern. As the order is significant, and you must finish it on time, you need a cutter for this work. So, you decide to build a cutting machine. Your problem is solved, and you have a machine that can be used in the future for the same type of work.

Figure 9.3 Woodcutting in a zigzag pattern. What do we learn from the above example? A machine was developed that performs a specific task. It can be reused for the same type of work. It takes a piece of wood as input and generates two pieces of wood in a zigzag pattern. Here, the machine is a function designed to solve a specific problem, and it can be reused any number of times. Similarly, during our program development, we can create some functions for solving a specific task, and then use that function several times throughout our code.

We have already used several predefined functions like printf() and scanf() for console I/O purposes. We have used these functions in every program. In fact, whatever program we have written till now contains at least one function, i.e., the main() function. That means some functions were there already as predefined functions; some functions we wrote for our purposes are called user-defined functions.

Let us think in another way. Suppose you have a large task to do. The usual procedure is to divide the task into smaller tasks, solve each one separately, and combine them to solve the bigger problem. This process is called modular programming, and modular programming employs the concept of functions. After we divide the whole task into subproblems, each subproblem can be implemented with a function. Combining the result of all functions, we can solve a bigger problem. Consider the problem of designing a calculator.

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Title: C programming : learn to code / Sisr Kumar Jena. Description: First edition. | Boca Raton, FL : Chapman & Hall/CRC Press, [2022] | Includes bibliographical references and index. | Summary: “The C programming language is a popular language in industries as well as academics. Since its invention and standardized as ANSI C, several other standards known as C99, C11, and C17 were published with new features in subsequent years.

This book covers all the traits of ANSI C and includes new features present in other standards. The content of this book helps a beginner to learn the fundamental concept of the C language. The book contains a step-by-step explanation of every program that allows a learner to understand the syntax and builds a foundation to write similar programs.

This is a short excerpt from the opening of “” by Unknown, quoted for review and introduction purposes. All rights belong to the copyright holders.

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