# %io

a variable, which keeps standard input and standard output (file descriptor)

## Calling Sequence

    %io(1)
                %io(2)

## Description

`%io(1)` returns standard input (file descriptor 5).

`%io(2)` returns standard output (file descriptor 6).

File descriptor 0 is the standard error.

## Examples

    mfprintf(%io(2),'Scilab stdout (C)');
    mfprintf(0,'Scilab stderr (C)');
    write(%io(2),'Scilab stdout (Fortran)');
    write(0,'Scilab stderr (Fortran)');
    [units,typ,names]=file()

## See Also

- write
- mfprintf
- file
- dispfiles