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Read (procedure)Language:
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Read (procedure)
- For typed files, reads a file component into a variable.
- For text files, reads one or more values into one or more variables
Declaration
Typed files
procedure Read(F , V1 [, V2,...,Vn ] );
Text files
procedure Read( [ var F: Text; ] V1 [, V2,...,Vn ] );
Target
Windows, Real, Protected
Remarks
With a type string variable:
Read reads all characters up to, but not including, the next
end-of-line marker or until Eof(F) becomes True; it does not skip
to the next line after reading. If the resulting string is longer
than the maximum length of the string variable, it is truncated.
After the first Read, each subsequent Read will see the end-of-line
marker and return a zero-length string.
Use multiple Readln calls to read successive string values.
When the extended syntax is enabled, Read can read null-terminated strings into zero-based character arrays.
With type integer or type real variables:
Read will skip any blanks, tabs, or end-of-line markers preceding the
numeric string.
If the numeric string does not conform to the expected format, an I/O
error occurs, otherwise the value is assigned to the variable.
The next Read will start with the blank, tab or end-of-line marker that
terminated the numeric string.
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