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Getting syntax error with awk ternary operator

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# 1  
Old 04-24-2015
Getting syntax error with awk ternary operator
Code:
split($7,a," "); date = a[1]; time = a[2]  
split(date,d,"/"); month = sprintf("%02d",d[1]); day = sprintf("%02d",d[2]); year = 2000 + d[3] % 100
split(time,t,":"); hour=t[1]; min=t[2]
hour >= 12? { hour=hour-12; amPm=" PM" } : amPM=" AM"
hour == 0? hour=12
time=sprintf("%02d",hour)":"sprintf("%02d",min)amPm

Code:
awk: cmd. line:9:                      hour >= 12? { hour=hour-12; amPm=" PM" } : amPM=" AM"
awk: cmd. line:9:                                  ^ syntax error
awk: cmd. line:9:                      hour >= 12? { hour=hour-12; amPm=" PM" } : amPM=" AM"
awk: cmd. line:9:                                                               ^ syntax error
awk: cmd. line:11:                      hour == 0? hour=12
awk: cmd. line:11:                                        ^ unexpected newline or end of string

I've tried seperating lines, adding more semicolons at the ends of the line or before the curly bracket BASH-style. Nothing seems to work.
I have other ternary statements in the code that work fine like:
Code:
$19 == "V"? valid = "0" : valid = $19
$22 == ""? comment = "0" : comment = $22

Mike
# 2  
Old 04-24-2015
Getting which syntax error?

The ternary operator returns its decision as a value, i.e. return( (x<0)?(-x):x ). If it doesn't make sense as an expression you can't cram it in there. { } blocks don't belong there.

I think you can put a function in there.

Code:
time = (hour >= 12) ? sprintf("%02d PM", hour-12) : sprintf("%02d AM", hour);

Last edited by Corona688; 04-24-2015 at 05:54 PM..
# 3  
Old 04-24-2015
Not sure what you mean by which syntax error? I posted the entire awk error output, there was nothing else.

OK, so I seperated it out into single expressions:
Code:
hour >= 12? amPm=" PM" : amPm=" AM"
hour >= 12? hour = hour - 12
hour == 0? hour = 12

The first line works, but the second two do not.
Code:
awk: cmd. line:11:                      hour >= 12? hour = hour - 12
awk: cmd. line:11:                                                  ^ unexpected newline or end of
awk: cmd. line:12:                      hour == 0? hour = 12
awk: cmd. line:12:                                          ^ unexpected newline or end of string

Is there some reason it works for strings and not for numbers?

I see your edit while I was posting. I don't think your code example handles midnight correctly, which is the reason I did not try to do it on one conditional.

00:00 needs to become 12:00 AM not 00:00 AM.

I'm just as interested in understanding why it is not working than finding working code.

Mike

---------- Post updated at 02:15 PM ---------- Previous update was at 02:06 PM ----------

Trying something else:
Code:
amPm= hour >= 12? " PM" : " AM"
hour= hour - hour >= 12? 12 : 0
hour= hour == 0? hour = 12 : hour

No errors. I need to ckeck the output.

So if that is the right way to use it, why do the string lines do exactly what is expected of them?
Code:
hour >= 12? amPm=" PM" : amPm=" AM"
$19 == "V"? valid = "0" : valid = $19
$22 == ""? comment = "0" : comment = $22

Mike
Last edited by Michael Stora; 04-24-2015 at 06:21 PM..
# 4  
Old 04-24-2015
Hi,
ternary operator is:
Code:
Condition ? one and only one true expr : one and only one false expr

you must have false expr also:
Code:
hour >= 12? amPm=" PM" : amPm=" AM"
hour >= 12? hour = hour - 12 : 0
hour == 0? hour = 12 : 0

Regards.
This User Gave Thanks to disedorgue For This Post:
Michael Stora
# 5  
Old 04-24-2015
Quote:
Originally Posted by disedorgue
you must have false expr also
Ahhhh . . . . Smilie

Code:
split($7,a," "); date = a[1]; time = a[2]
split(date,d,"/"); month = sprintf("%02d",d[1]); day = sprintf("%02d",d[2]); year = 2000 + d[3] % 100
split(time,t,":"); hour=t[1]; min=t[2]
amPm= hour >= 12? "PM" : "AM"
hour= hour - ( hour >= 12? 12 : 0 )
hour= hour == 0? hour = 12 : hour    # To handle midnight
time= sprintf("%02d",hour) ":" sprintf("%02d ",min) amPm

Mike

---------- Post updated at 03:13 PM ---------- Previous update was at 02:27 PM ----------

An afterthought . .. we can do nothing after the :
Code:
split($7,a," "); date = a[1]; time = a[2]
split(date,d,"/"); month = sprintf("%02d",d[1]); day = sprintf("%02d",d[2]); year = 2000 + d[3] % 100
split(time,t,":"); hour=t[1]; min=t[2]
amPm= hour >= 12? "PM" : "AM"
hour >= 12? hour = hour - 12 : ""
hour == 0? hour = 12 : "" #    To handle midnight
time= sprintf("%02d",hour) ":" sprintf("%02d ",min) amPm

Last edited by Michael Stora; 04-24-2015 at 06:37 PM..
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