C Programming Exercises, Practice, Solution : File Handling
C File Handling [19 exercises with solution]
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1. Write a program in C to create and store information in a text file.
Test Data :
Input a sentence for the file : This is the content of the file test.txt.
Expected Output :
The file test.txt created successfully...!!
2. Write a program in C to read an existing file.
Test Data :
Input the file name to be opened : test.txt
Expected Output :
The content of the file test.txt is : This is the content of the file test.txt.
3. Write a program in C to write multiple lines to a text file.
Test Data :
Input the number of lines to be written : 4
:: The lines are ::
test line 1
test line 2
test line 3
test line 4
Expected Output :
The content of the file test.txt is : test line 1 test line 2 test line 3 test line 4
4. Write a program in C to read the file and store the lines in an array.
Test Data :
Input the file name to be opened : test.txt
Expected Output :
The content of the file test.txt are : test line 1 test line 2 test line 3 test line 4
5. Write a program in C to find the number of lines in a text file.
Test Data :
Input the file name to be opened : test.txt
Expected Output :
The lines in the file test.txt are : 4
6. Write a program in C to find the content of a file and the number of lines in a text file.
Test Data :
Input the filen ame to be opened : test.txt
Expected Output :
The content of the file test.txt are : test line 1 test line 2 test line 3 test line 4 The lines in the file are : 4
7. Write a program in C to count the number of words and characters in a file.
Test Data :
Input the file name to be opened : test.txt
Expected Output :
The content of the file test.txt are : test line 1 test line 2 test line 3 test line 4 The number of words in the file test.txt are : 12 The number of characters in the file test.txt are : 36
8. Write a program in C to delete a specific line from a file.
Assume that the content of the file test.txt is : test line 1 test line 2 test line 3 test line 4
Test Data :
Input the file name to be opened : test.txt
Input the line you want to remove : 2
Expected Output :
The content of the file test.txt is : test line 1 test line 3 test line 4
9. Write a program in C to replace a specific line with another text in a file.
Assume that the content of the file test.txt is : test line 1 test line 2 test line 3 test line 4
Test Data :
Input the file name to be opened : test.txt
Input the content of the new line : Yes, I am the new text instead of test line 2
Input the line no you want to replace : 2
Expected Output :
Replacement did successfully..!!
10. Write a program in C to append multiple lines to the end of a text file.
Assume that the content of the file test.txt is : test line 1 test line 2 test line 3 test line 4
Test Data :
Input the file name to be opened : test.txt
Input the number of lines to be written : 3
The lines are :
test line 5
test line 6
test line 7
Expected Output :
The content of the file test.txt is :
test line 1
test line 2
test line 3
test line 4
test line 5
test line 6
test line 7
11. Write a program in C to copy a file to another name.
Assume that the content of the file test.txt is : test line 1 test line 2 test line 3 test line 4
Test Data :
Input the source file name : test.txt
Input the new file name : test1.txt
Expected Output :
The file test.txt copied successfully in the file test1.txt.
If you read the new file you will see the content of the file :
test line 1 test line 2 test line 3 test line 4
12. Write a program in C to merge two files and write them to another file.
Assume that the content of the file test.txt and test1.txr is : The content of the file test.txt is : This is the file test.txt. The content of the file test1.txt is : This is the file test1.txt.
Test Data :
Input the 1st file name : test.txt
Input the 2nd file name : test1.txt
Input the new file name where to merge the above two files : mergefiles.txt
Expected Output :
The two files merged into mergefiles.txt file successfully..!!
Here is the content of the merge file mergefiles.txt :
The content of the file mergefiles.txt is : This is the file test.txt. This is the file test1.txt.
13. Write a program in C to encrypt a text file.
Assume that, the content of the file test.txt is : Welcome to w3resource.com.
Test Data :
Input the name of file to encrypt : test.txt
Expected Output :
File test.txt successfully encrypted ..!!
If you read the file test.txt you will see the following :
������Ʉ�ӄۗ�������ɒ��ђn
14. Write a program in C to decrypt a previously encrypted file.
Assume that, the content of the file test.txt was : ������Ʉ�ӄۗ�������ɒ��ђn After encryption, the content of the file is : Welcome to w3resource.com.
Test Data :
Input the name of file to decrypt : test.txt
Expected Output :
The file test.txt decrypted successfully..!!
Now, if you read the file test.txt you will see the following :
Welcome to w3resource.com.
15. Write a program in C to remove a file from the disk.
Test Data :
Input the name of file to delete : test.txt
Expected Output :
The file test.txt is deleted successfully..!!
16. A set of strings represent directory paths and a single character directory separator (/). Write a program in C language to get a part of the directory tree that is common to all directories.
Test Data:
({/home/me/user/temp/a", "/home/me/user/temp/b","/home/me/user/temp/c/d"}) ->
/home/me/user/temp
17. Write a program in C to read from a file into a variable and write a variable's contents into a file.
18. Write a program in C to display the last modification time of a file.
Test Data:
Last date of File modification: Sat Nov 26 17:32:15 2022
19. Write a program in C language to find the size of a given file.
Test Data:
Size of the said File: 34 bytes.
C Programming Code Editor:
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