August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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6.18. Kalkulator wykorzystujący notację RPN
Problem
Choć operacje konwersji liczb binarnych na dziesiętne, ósemkowe i szesnastkowe można wykonywać w pamięci, to jednak nie jest to najłatwiejsze zadanie. Można je oczywiście zrealizować za pomocą kalkulatora, ale nigdy nie ma go pod ręką. Co zrobić w takim przypadku?
Rozwiązanie
Można napisać kod kalkulatora, wykorzystując do tego celu operacje arytmetyczne powłoki oraz notację RPN:
#!/usr/bin/env bash # plik receptury: rpncalc # # Tekstowy kalkulator dla liczb całkowitych wykorzstujący notację RPN # # Parametry do obliczeń musą być zapisywane zgodnie # z formatem: a b op # zamiast operatora * można użyć znaku x # # sprawdzenie liczby parametrów: if [ \( $# -lt 3 \) -o \( $(($# % 2)) -eq 0 \) ] then ...
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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.
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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.