August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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2.3. Formatowanie danych wyjściowych
Problem
Chcemy mieć większy wpływ na formatowanie i rozmieszczenie poszczególnych informacji w zestawieniu wynikowym.
Rozwiązanie
Należy wykorzystać wbudowane polecenie printf.
Zgodnie z poniższym przykładem:
$ printf '%s = %d\n' Wierszy $LINES
Wierszy = 24
$lub
$ printf '%-20.20s = %4.2f GHz\n' 'Częstotliwość' 1.92735
Częstotliwość = 1.93 GHz
$Analiza
Wbudowane polecenie printf działa w taki sam sposób, jak instrukcja o tej samej nazwie w języku C. Pierwszy parametr odpowiada ciągowi formatu. Natomiast kolejne parametry są formatowane zgodnie z definicją formatowania (%).
Wartości liczbowe występujące między znakiem % a specyfikatorem formatu (w przedstawionych przykładach są to znaki s, f i d) określają dodatkowe ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.