04-21-2013
Don Cragun, that may be a good way to test our programs by giving standard input (without specifying any file name). I had run awk programs by giving stnd input.
Now, what I want to say is:
As many told that why I see a link between 'read' and 'continue/break', I also wondered why they wrote so. Because my 1st post reflects the connection. Based on the user input read by the read statement, either 'continue' is executed or 'break' is executed. See my codes, if user inputs 'y' , 'continue' is executed orelse 'break'. I hope this should show the connection.
Now , coming to the other point :--" what is the use of 'continue/break' if awk doesn't understand 'read' statement". You all are right to say that 'continue/break' is used in awk without user interference or without user input. The reason I told becz I have used programs which execute 'continue or break' based on the input as the example I gave you. so, I thought that if user input is not to be used, then the code doesn't need continue or break. If possible, may I expect anyone to give a small algorithm or example to show how without user input, 'continue/break' makes sense.
Alister thanks to say a way of reading stnd input. I will check how it works.
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break(3tcl) Tcl Built-In Commands break(3tcl)
__________________________________________________________________________________________________________________________________________________
NAME
break - Abort looping command
SYNOPSIS
break
_________________________________________________________________
DESCRIPTION
This command is typically invoked inside the body of a looping command such as for or foreach or while. It returns a TCL_BREAK code, which
causes a break exception to occur. The exception causes the current script to be aborted out to the innermost containing loop command,
which then aborts its execution and returns normally. Break exceptions are also handled in a few other situations, such as the catch com-
mand, Tk event bindings, and the outermost scripts of procedure bodies.
EXAMPLE
Print a line for each of the integers from 0 to 5:
for {set x 0} {$x<10} {incr x} {
if {$x > 5} {
break
}
puts "x is $x"
}
SEE ALSO
catch(3tcl), continue(3tcl), for(3tcl), foreach(3tcl), return(3tcl), while(3tcl)
KEYWORDS
abort, break, loop
Tcl break(3tcl)