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What are “first class” objects?
When are objects or something else said to be "first class" in a given programming language, and why? In what do they differ from languages where they are not?
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Why is sizeof considered an operator?
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Because the C standard says so, and it gets the only vote.
As consequences:
The operand of sizeof can be a parenthesised type, sizeof (int), instead of an object expression.
The parentheses are unnecessary: int a; printf("%d\n", sizeof a); is perfectly fine. Th...
How to exit a 'git status' list in a terminal?
I'm new to Git and the terminal. How can I exit a listing mode generated by the git status command?
14 Answers
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How to add leading zeros for for-loop in shell? [duplicate]
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Use the following syntax:
$ for i in {01..05}; do echo "$i"; done
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02
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05
Disclaimer: Leading zeros only work in >=bash-4.
If you want to use printf, nothing prevents you from putting its result in a variable for further use:
$ fo...
How to create the branch from specific commit in different branch
I have made several commits in the master branch and then merged them to dev branch.
5 Answers
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Easy pretty printing of floats in python?
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It's an old question but I'd add something potentially useful:
I know you wrote your example in raw Python lists, but if you decide to use numpy arrays instead (which would be perfectly legit in your example, because you seem to be dealing with arrays of numbers), ...
gcc makefile error: “No rule to make target …”
I'm trying to use GCC (linux) with a makefile to compile my project.
17 Answers
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OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection
...ow need to filter the output, because it's quite messy - or is my code wrong?
6 Answers
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In Python, using argparse, allow only positive integers
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This should be possible utilizing type. You'll still need to define an actual method that decides this for you:
def check_positive(value):
ivalue = int(value)
if ivalue <= 0:
raise argparse.ArgumentTypeError("%s is an invalid positive in...
How can I start an interactive console for Perl?
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You can use the perl debugger on a trivial program, like so:
perl -de1
Alternatively there's Alexis Sukrieh's Perl Console application, but I haven't used it.
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