read a float from a file - Maple Help

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FileTools[Text][ReadFloat] - read a float from a file

Calling Sequence

ReadFloat(file)

Parameters

file

-

file descriptor or filename

Description

• 

The ReadFloat(file) command attempts to read a float from file.  The ReadFloat command skips whitespace until an integer or non-whitespace character is found.  If there is a valid float, it is read from file and returned.  If the characters do not form a valid float, then NULL is returned.

• 

If no float is found, the file position is reset to its value before the call to ReadFloat was made.

• 

To determine if the end of the file has been reached, use AtEndOfFile.

• 

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

• 

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

Examples

FileTools[Text]Opentestfile

0

(1)

FileTools[Text]WriteStringtestfile,2.73 to 3.14

12

(2)

FileTools[Text]Closetestfile:

FileTools[Text]ReadFloattestfile

2.73

(3)

FileTools[Text]ReadFloattestfile

FileTools[Text]ReadStringtestfile

to

(4)

FileTools[Text]ReadFloattestfile

3.14

(5)

FileTools[Text]ReadFloattestfile

See Also

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


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