Lecture 20 | Mastering C Programming: Standard Library Functions and User-Defined Functions

Welcome to Lecture 20 of our comprehensive C Programming series! In this session, we delve into the powerful world of functions, exploring both standard library functions and user-defined functions. Understanding these functions is crucial for any C programmer, as they provide a toolkit for efficient and modular programming.

Key Topics Covered:

1. Standard Library Functions: Learn about essential functions provided by the C standard library that can simplify your code and streamline common tasks. We'll explore functions for input/output, string manipulation, mathematical operations, and more.

2. User-Defined Functions: Dive into the art of creating your functions. Discover how to define, prototype, and implement functions to modularize your code, enhance readability, and promote code reusability.

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Please answer the following interview questions in the comment section below:

# 1. Theory Question: Explain the role of standard library functions in C. Provide examples of commonly used standard library functions and describe their functionalities.

# 2. Coding Question: Write a C program that uses the 'strlen' standard library function to determine the length of a given string. Explain the steps in your code.

# 3. Theory Question: Differentiate between call by value and call by reference in the context of user-defined functions in C. Provide examples to illustrate each.

# 4. Coding Question: Develop a C program that defines a user-defined function to calculate the factorial of a given integer. Demonstrate its usage in the main program.

# 5. Theory Question: Discuss the advantages of using user-defined functions in C programming. How can they contribute to code modularity and reusability?

# 6. Coding Question: Write a C program that uses the 'sqrt' standard library function to calculate and display the square root of a user-inputted number. Handle invalid input appropriately.

# 7. Theory Question: Explain the significance of the 'return' statement in a user-defined function. How does it affect the flow of execution in a program?

# 8. Coding Question: Create a C program that defines a function to check if a given number is prime. Use this function to identify and print all prime numbers within a specified range.

Feel free to share your responses, code, and insights!