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How to write loop in a Makefile?
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The following will do it if, as I assume by your use of ./a.out, you're on a UNIX-type platform.
for number in 1 2 3 4 ; do \
./a.out $$number ; \
done
Test as follows:
target:
for number in 1 2 3 4 ; do \
echo $$number ; \
done
produces...
Ruby on Rails: Where to define global constants?
...sible" for the constants you should stick them there. You can create class methods to access them without creating a new object instance:
class Card < ActiveRecord::Base
def self.colours
['white', 'blue']
end
end
# accessible like this
Card.colours
Alternatively, you can create class ...
Copy array by value
...erences into the new array. Both the original and new array refer to the same object. If a referenced object changes, the changes are visible to both the new and original arrays.
Primitives such as strings and numbers are immutable, so changes to the string or number are impossible.
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What is the difference between a directory and a folder?
...ople use the terms "folder" and "directory" interchangeably. From a programmer point of view, is there a difference, and if so, what is it? Does it depend on the OS, or is there a broad, general consensus? This at least suggests that there is a difference.
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are there dictionaries in javascript like python?
... it's worth noting that the first example should yield the same object in both languages using exactly same syntax except the closing ';'. states_dictionary={ "CT":["alex","harry"], "AK":["liza","alex"], "TX":["fred", "harry"] }
– Denis C
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Bash: If/Else statement in one line
I am trying to check if a process (assume it is called some_process ) is running on a server. If it is, then echo 1, otherwise echo 0.
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Why is it impossible to build a compiler that can determine if a C++ function will change the value
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Why is it impossible to build such a compiler?
For the same reason that you can't write a program that will determine whether any given program will terminate. This is known as the halting problem, and it's one of those things that's not computable.
To be clear, you can write a co...
How to move screen without moving cursor in Vim?
...u can recover from an oops. (Non-portable hacks incoming:) Third, do the same but from your user keyboard config, e.g. Windows key + Z; for maps to sequences, try xdotool or triggerhappy. Finally, display your caps lock state (can't be done in Vimscript.)...
– John P
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Converting dd/mm/yyyy formatted string to Datetime [duplicate]
...DotNet and C#. I want to convert a string in mm/dd/yyyy format to DateTime object. I tried the parse function like below but it is throwing a runtime error.
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A monad is just a monoid in the category of endofunctors, what's the problem?
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That particular phrasing is by James Iry, from his highly entertaining Brief, Incomplete and Mostly Wrong History of Programming Languages, in which he fictionally attributes it to Philip Wadler.
The original quote is from Saunders Mac Lane in Categories for...