- 1 year ago
How are strings on text file overwritten in Windows C programming?
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In C programming on Windows, you can overwrite strings in a text file by following these steps:
- Open the file in the desired mode using the
fopen()
function. To overwrite the file, use the"w"
mode. If the file doesn't exist, it will be created. If it does exist, its contents will be truncated.
cFILE* file = fopen("filename.txt", "w");
- Check if the file was opened successfully. If
file
isNULL
, there was an error opening the file.
cif (file == NULL) {
printf("Error opening the file.\n");
return;
}
- Position the file pointer to the desired location where you want to overwrite the string. You can use the
fseek()
function to move the file pointer to a specific position in the file. If you want to overwrite the entire file, you can skip this step.
cfseek(file, position, SEEK_SET);
Replace position
with the byte offset from the beginning of the file where you want to start overwriting. If you want to overwrite from the beginning, use 0
as the position.
- Use the
fprintf()
function to write the new string to the file. This function works similarly toprintf()
, but instead of printing to the console, it writes to the file.
cfprintf(file, "This is the new string.");
Replace "This is the new string."
with the actual string you want to overwrite with.
- Close the file using the
fclose()
function to release the resources associated with it.
cfclose(file);
By following these steps, you can overwrite strings in a text file using C programming on Windows.