read the next float from a file - Maple Help

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FileTools[Text][ReadNextFloat] - read the next float from a file

Calling Sequence

ReadNextFloat(file)

Parameters

file

-

file descriptor or filename

Description

• 

The ReadNextFloat(file) command attempts to read a float from file.  The ReadNextFloat function skips characters until it finds a valid float.  It then reads the float and returns it.  If no characters match a valid float, then the end of file is reached and NULL is returned.

• 

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

• 

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,2.73 to 3.14 for

16

(1)

FileTools[Text]Closetestfile:

FileTools[Text]ReadNextFloattestfile

2.73

(2)

FileTools[Text]ReadNextFloattestfile

3.14

(3)

FileTools[Text]ReadNextFloattestfile

FileTools[AtEndOfFile]testfile

true

(4)

See Also

file, FileTools[AtEndOfFile], FileTools[Text], FileTools[Text][Close], FileTools[Text][ReadCharacter], FileTools[Text][ReadString], FileTools[Text][WriteFloat], IO_errors


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