The API:
int read4(char *buf) reads 4 characters at a time from a file.
The return value is the actual number of characters read. For example, it returns 3 if there is only 3 characters left in the file.
By using the
read4 API, implement the function int read(char *buf, int n) that reads n characters from the file.
Note:
The
The
read function may be called multiple times.
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