read the next integer from a file - Maple Help

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FileTools[Text][ReadNextInteger] - read the next integer from a file

Calling Sequence

ReadNextInteger(file)

Parameters

file

-

file descriptor or filename

Description

• 

The ReadNextInteger(file) command attempts to read an integer from file. The ReadNextInteger function skips non-numeric characters until a valid integer is found.  The integer is read from file and returned.  If no characters form a valid integer, then NULL is returned.  In this case, the file is read to the end of the file.

• 

If file is the name of a file that has not been opened, Maple attempts to open the file before attempting to read the integer.

• 

An error is raised if file is not a valid descriptor or if it is the name of a file that cannot be opened.

Examples

FileTools[Text]WriteStringtestfile,1 two 3 four

12

(1)

FileTools[Text]Closetestfile:

FileTools[Text]ReadNextIntegertestfile

1

(2)

FileTools[Text]ReadNextIntegertestfile

3

(3)

FileTools[Text]ReadNextIntegertestfile

FileTools[AtEndOfFile]testfile

true

(4)

See Also

file, FileTools[AtEndOfFile], FileTools[Text], FileTools[Text][Close], FileTools[Text][Open], FileTools[Text][ReadCharacter], FileTools[Text][ReadString], FileTools[Text][WriteInteger], FileTools[Text][WriteString], IO_errors


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