Learn and Master C Programming - Important Tips for Working with User Input

This lecture addresses the limitations of input functions, focusing on techniques to clear the input buffer and handle user input more effectively. It covers methods to manage the input buffer using scanf and file seek, emphasizing the importance of understanding scanf's limitations and error handling. The lecture also introduces alternative secure input functions like gets_s, highlighting the risks of using insecure functions like gets.

What is one of the main issues with the scanf function?

• It automatically clears the input buffer.

• It does not require error handling.

• It always returns a success code.

• It can leave residual data in the input buffer.

Which technique involves reading one character at a time to clear the input buffer?

• Using a buffer overflow

• Using a direct input method

• Using a character reading loop

• Using a file pointer

What is a key consideration when using the scanf function?

• Ignoring the return code

• Understanding its limitations and handling errors

• Using it without any prior knowledge

• Avoiding any error checking

What should you always check when using input functions like scanf?

• The return code for errors

• The speed of the processor

• The size of the screen

• The color of the text

Which function is recommended as a secure alternative to scanf?

• getchar

• printf

• gets_s

• scanf_s

Why is the gets function considered dangerous?

• It does not read input

• It is too slow

• It can cause buffer overruns

• It is not compatible with modern systems

What is a benefit of using gets_s over gets?

• It allows unlimited input size

• It automatically corrects errors

• It prevents buffer overruns by limiting input size

• It requires no error checking