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A.8.3 Sequential Input-Output Operations

Static Semantics

1
The operations available for sequential input and output are described in this subclause. The exception Status_Error is propagated if any of these operations is attempted for a file that is not open. 
2
procedure Read(File : in File_Type; Item : out Element_Type);
3
Operates on a file of mode In_File. Reads an element from the given file, and returns the value of this element in the Item parameter. 
4
The exception Mode_Error is propagated if the mode is not In_File. The exception End_Error is propagated if no more elements can be read from the given file. The exception Data_Error can be propagated if the element read cannot be interpreted as a value of the subtype Element_Type (see A.13, “Exceptions in Input-Output”).
5
procedure Write(File : in File_Type; Item : in Element_Type);
6
Operates on a file of mode Out_File or Append_File. Writes the value of Item to the given file.
7
The exception Mode_Error is propagated if the mode is not Out_File or Append_File. The exception Use_Error is propagated if the capacity of the external file is exceeded.
8
function End_Of_File(File : in File_Type) return Boolean;
9
Operates on a file of mode In_File. Returns True if no more elements can be read from the given file; otherwise returns False.
10
The exception Mode_Error is propagated if the mode is not In_File. 

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