DIY: Read N Characters Given Read4 II — Call Multiple Times
Understand how to build a read function that calls the read4 API to read a specified number of characters from a file over multiple calls. This lesson helps you manage file reading states and buffers efficiently while meeting constraints seen in Amazon-like coding interview problems.
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Problem statement
Suppose that you can only read a given File using a specific API method called read4. You will implement the read method to read n characters from the File. This read method can be called multiple times.
read4() API:
The read4() API reads the next four consecutive characters from the File, until the File no longer has any characters that need to be read. After reading, the read4() method writes the characters into the array named buff.
The read4() method uses its own file pointer to keep track of the characters that have already been read.
Function ...