Re: questions on input/output

["Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>]

On 2/5/21 11:50 PM, Mehdi Saada wrote:
> I can't understand how input/output works.
> 1) on text files - not keyboard input - what's the difference between get_immediate and get ?

Get_Immediate might behave differently at a line terminator.

> 2) what means "consumming" characters, if indices don't change ?

It is usually best to only use Get_Immediate with Standard_Input, and to ignore 
the column, line, and page counting and setting operations.

> 3) can set_col be used or not, to go back in a line in an IN_FILE file ?

You cannot go back in a text file. Only Direct_IO and Stream_IO support this.

> I need: to read a character, until some marker, then go back (set_col(stored_position)) and read again but store it like Get(variable, FILE); then go past the marker (set_col(FILE,col(file)+1)).

You will probably want to store the characters that you read in a string and 
obtain the value from it.

-- 
Jeff Carter
"I wave my private parts at your aunties."
Monty Python & the Holy Grail
13