Question

In what mode do you open a file if you want to write data to it, but you do not want to erase the file's existing contents? When you write data to such a file, to what part of the file is the data written?

Short answer

Answer: The 'append' mode, represented as 'a', allows data to be added without erasing existing contents. The data will be written at the end of the file.

Step-by-step solution

Identify the correct file mode

To write data to a file without erasing its existing contents, the file should be opened in 'append' mode, which is represented as 'a'.

Determine where the data will be written

When writing data to a file in append mode, the data is written at the end of the file, preserving the existing contents.