Practice Top C Programming Questions on File Handling

Practice Top C Programming Questions on File Handling

Q1. Write a program to create a file and write "Hello, World!" into it.

Expected Output: A file named output.txt containing "Hello, World!".

Q2. Write a program to read and display the contents of a file.

Input: A file named input.txt containing "C programming is fun!".  
Output: C programming is fun!

Q3. Write a program to append "Appending this line!" to an existing file.

Input: A file named log.txt.  
Output: The file contains the appended line.

Q4. Write a program to copy the contents of one file into another.

Input: source.txt contains "Copy this text.".  
Output: destination.txt contains "Copy this text.".

Q5. Write a program to count the number of characters in a file.

Input: A file named data.txt containing "Hello".  
Output: Number of characters: 5

Q6. Write a program to count the number of words in a file.

Input: file.txt contains "C programming is fun".  
Output: Number of words: 4

Q7. Write a program to count the number of lines in a file.

Input: A file with 3 lines.  
Output: Number of lines: 3

Q8. Write a program to check if a file exists.

Input: Check for test.txt.  
Output: File exists. or File does not exist.

Q9. Write a program to read a file and print its content in reverse order.

Input: sample.txt contains "ABC".  
Output: CBA

Q10. Write a program to write numbers from 1 to 10 into a file.

Output: A file named numbers.txt containing "1 2 3 4 5 6 7 8 9 10".

Q11. Write a program to search for a specific word in a file.

Input: File contains "Learn C programming". Search for "C".  
Output: Word found.

Q12. Write a program to convert the content of a file to uppercase.

Input: File contains "hello".  
Output: File updated to "HELLO".

Q13. Write a program to convert the content of a file to lowercase.

Input: File contains "HELLO".  
Output: File updated to "hello".

Q14. Write a program to write a structure containing student details to a file.

Input: Name: John, Age: 20.  
Output: File contains student details.

Q15. Write a program to read a structure containing student details from a file.

Output: Displays the student details.

Q16. Write a program to delete a file.

Input: delete_me.txt  
Output: File deleted successfully.

Q17. Write a program to rename a file.

Input: Rename oldname.txt to newname.txt.  
Output: File renamed.

Q18. Write a program to count the occurrences of a specific character in a file.

Input: Count 'e' in "Hello there".  
Output: Occurrences of 'e': 3

Q19. Write a program to write even numbers between 1 and 20 to a file.

Output: 2 4 6 8 10 12 14 16 18 20

Q20. Write a program to merge the contents of two files into a third file.

Input: file1.txt and file2.txt.  
Output: merged.txt contains content from both.

Q21. Write a program to count the number of vowels in a file.

Input: File contains "Hello".  
Output: Vowels: 2

Q22. Write a program to find the longest word in a file.

Input: File contains "Hello world!".  
Output: Longest word: Hello

Q23. Write a program to display the size of a file in bytes.

Input: example.txt  
Output: File size: 15 bytes

Q24. Write a program to check if a file is empty.

Input: empty.txt  
Output: File is empty. or File is not empty.

Q25. Write a program to write some text into a file and then read and display it.

Output: Displays the text written.

Q26. Write a program to read a file and display its contents in sorted order.

Input: File contains "banana apple cherry".  
Output: apple banana cherry

Q27. Write a program to replace a word in a file.

Input: Replace "old" with "new".  
Output: File updated.

Q28. Write a program to count the number of non-alphanumeric characters in a file.

Input: "C@2024!"  
Output: Non-alphanumeric characters: 2

Q29. Write a program to read and display the contents of a file line by line.

Output: Each line displayed separately.

Q30. Write a program to create multiple files based on user input.

Input: Number of files = 3.  
Output: 3 files created.