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fileoutputada
Numnumberry
Numnumberry

Reputation: 395

Ada: Write to File Multiple Times

In Ada, can you open, write to, close, then reopen, write to, and close a txt file without it being overwritten? Like continue from where it last left off? Thanks!

Upvotes: 1

Views: 240

Answers (1)

Jacob Sparre Andersen
Jacob Sparre Andersen

Reputation: 6601

Yes. If you look in section A.10.1 in the reference manual, you can see that the package Ada.Text_IO includes the declaration:

type File_Mode is (In_File, Out_File, Append_File);

Append_File is the mode you are looking for.

A.10.2(3) in the reference manual requires that you get a new line, when you close a file:

For the procedure Close: If the file has the current mode Out_File or Append_File, has the effect of calling New_Page, unless the current page is already terminated; then outputs a file terminator.

... where A.10.5(16) explains what New_Page does:

Operates on a file of mode Out_File or Append_File. Outputs a line terminator if the current line is not terminated, or if the current page is empty (that is, if the current column and line numbers are both equal to one). Then outputs a page terminator, which terminates the current page. Adds one to the current page number and sets the current column and line numbers to one.

If you want more detailed control over what ends up in a file, you should use one of the other I/O packages.

Upvotes: 4

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