How do you clear the contents of a text file in C++?

5 Answers. If you simply open the file for writing with the truncate-option, you’ll delete the content.

How do I delete a specific line from text file in C?

Delete from a text file using C

1. #include
2. int main(){
3. FILE *fptr1, *fptr2;
4. char file1[] =”file1.txt”;
5. char file2[] =”file2.txt”;
6. char curr;
7. int del, line_number = 0;
8. printf(“Please enter the line number you want to delete : “);

How do I delete certain words in a text file?

Step by step descriptive logic to remove a word from text file.

1. Open source file in r (read) mode.
2. Create and open a temporary file say delete.
3. Read word to remove from user in some variable say toRemove .
4. Read a line from source file fPtr and store it in temporary buffer variable.

How do you delete a specific line in a file?

Using a Number to Delete a Line

1. Open the file in read mode.
2. Read the files contents.
3. Open the file in write mode.
4. Use a for loop to read each line and write it to the file.
5. When we reach the line we want to delete, skip it.

How do you clear a text file in C#?

Simply write to file string. Empty , when append is set to false in StreamWriter. I think this one is easiest to understand for beginner. You can use always stream writer.It will erase old data and append new one each time.

How do you create an empty file in C++?

If you want a completely empty file, you can use ‘s std::ofstream , and not even call the object. Note: this assumes that the file does not already exist. If it does then you should remove it first if you want it replaced with a blank file.

How do you delete one line from a text file in C++?

open(“temp. txt”); cout << “Which line do you want to remove? “; cin >> deleteline; while (getline(fin,line)) { if (line != deleteline) { temp << line << endl; } } temp.

How do you delete a specific line from a text file in Java?

Deleting a text line directly in a file is not possible. We have to read the file into memory, remove the text line and rewrite the edited content….There is no magic to removing lines.

1. Copy the file line by line, without the line you don’t want.
2. Delete the original file.
3. rename the copy as the original file.

How do I delete everything except text in Word?

Removing All Text Boxes In a Document

1. In your document, press Ctrl+A. The entire document is selected.
2. Press Ctrl+C. The document is now on the Clipboard.
3. Open a new, blank document.
4. Choose Paste Special from the Edit menu.
5. In the list of formats, choose Unformatted Text.
6. Click on OK.

How do I remove line numbers from a text file?

On the Layout tab, in the Page Setup group, click Line Numbers. Do one of the following: To remove line numbers from the entire document or section, click None. To remove line numbers from a single paragraph, click Suppress for Current Paragraph.

How do you delete a specific line in a file using sed?

The syntax is ; where can be either a single line like 5 or a range of lines like 5,10 , and the command d deletes the given line or lines. The addresses can also be regular expressions, or the dollar sign $ indicating the last line of the file.

How do I delete a specific line from a text file?

How do I delete a specific line from text file in C? There are several ways you can delete a line, one simple method is to open two files, one in and one out. then copy line by line and skip the line you want to delete after you are done, delete the old file and rename the new one to the old name.

How do I read a line in a text file?

Read a line (TextReader.ReadLine) – if you don’t want to delete it, write it to the output file (TextWriter.WriteLine) When you’ve read all the lines, close both the reader and the writer (if you use usingstatements for both, this will happen automatically)

How do I remove a line from a string array?

Remove the offending line (in this case it’s probably easiest to convert the string array into a List then remove the line) Write all the rest of the lines back (e.g. with File.WriteAllLines) – potentially convert the List into a string array again using ToArray

How do I delete a word from a file?

There is no way to delete something from a file. Filesystems do not support it. Thats how you can modify the file’s contents: So to remove a word, you should either read the whole file to memory, delete the word, and then rewrite it, or replace the word by spaces (or any other characters).