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FileTools[Text]

  

ReadFloat

  

read a float from a file

 

Calling Sequence

Parameters

Description

Examples

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][Open]testfile

0

(1)

FileTools[Text][WriteString]testfile,2.73 to 3.14

12

(2)

FileTools[Text][Close]testfile:

FileTools[Text][ReadFloat]testfile

2.73

(3)

FileTools[Text][ReadFloat]testfile

FileTools[Text][ReadString]testfile

to

(4)

FileTools[Text][ReadFloat]testfile

3.14

(5)

FileTools[Text][ReadFloat]testfile

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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