When opening a file with fopen, what happens if the file does not exist and the mode is set to 'r'?
- It appends data to the existing file.
- It creates a new file.
- It overwrites the file's content.
- It returns a NULL pointer.
When opening a file with fopen in read mode ('r') and the file doesn't exist, it returns a NULL pointer, indicating that the file was not successfully opened.
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