read a single character from a file
file descriptor or filename
The ReadCharacter(file) command reads a single character from file. The character is returned as a string of length 1.
If file is the name of a file that has not been opened, Maple attempts to open the file before reading the character.
An error is raised if file is not a valid descriptor or if it is the name of a file that does not exists.
If the end of the file has been reached, ReadCharacter returns NULL.
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