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Questions tagged [parentheses]

The symbols "(" and ")", commonly used in programming languages. Please use this tag only if the specific usage of these symbols is a relevant part of the question.

The parentheses "(" and ")" are special cases of brackets, along with square brackets ("[" and "]") and curly brackets (or braces) ("{", "}").

Parentheses (singular parenthesis) have many uses in most programming languages, such as:

  • indicate the arguments of a function call;
  • specify the order of evaluation/execution of expressions;
  • create lists/arrays/vectors.
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What do parentheses in binding paths mean?

Recently i've read 'Databinding overview' article at MSDN and there is such sample code: I know that {} means markup…
igorGIS
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Two strings between brackets separated by a comma in C++

I came across unexpected (to me at least) C++ behavior today, shown by the following snippit: #include int main() { std::cout << ("1", "2") << std::endl; return 0; } Output: 2 This works with any number of strings between the…
Adversus
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Keeping parentheses balanced (Paredit for Vim?)

Emacs has Paredit which actively prevents you from typing unbalanced parentheses (short of C-Q ( to force-insert a literal one, or other craziness). Inserting an open paren also inserts a closing one. Backspacing over a paren either deletes both…
Brian Carper
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Calling the parenthesis overload given a pointer

I can overload the parenthesis operator using the following signature: char& operator()(const int r, const int c); The intended usage of this would be: // myObj is an object of type MyClass myObj(2,3) = 'X' char Y = myObj(2,3); Which works as I…
chessofnerd
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Why do some Python functions have an extra set of parenthesis around the argument list?

I've seen some Python functions written like this: def get_year((year,prefix,index,suffix)): return year How does that differ (if at all) from other functions without the extra parentheses like this: def do_format(yr,pfx,id,sfx): return "%s %s…
WilliamKF
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Why are tokens wrapped by parentheses not r-value expressions?

Consider the following code: #include struct Foo { Foo() : bar( 0 ) {} int bar; }; int main() { Foo foo; ++(foo.bar); std::cout<< foo.bar << std::endl; system("pause"); return 0; }; Why does foo.bar evaluate to…
Martin85
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Changing Paredit Formatting

When using paredit in programming modes such as C, typing ( will insert a space before the paren when I'm trying to call a function, leaving me with: foo () Is there a way to disable the insertion of the space without changing paredit's source?
Nathaniel Flath
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Parenthesizing a string so that expression takes a given value

The following problem is from the chapter on Dynamic Programming by Vazirani et. al. [6.6]Let us define a multiplication operation(×) on three symbols a; b; c according to the following table: Therefore, a × a = b , a × b = b etc. Find an…
curryage
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Parentheses pairing ({}[]()<>) issue

I want to be able to pair up all parentheses in a string, if they aren't paired then then they get their index number and False. It seems like it is repeating some values over and over, i.e cl == pop[1]. I have tried to see where the problem is but…
thabubble
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Why is the Object.keys() method not added to Object.prototype?

I am confused about why JavaScript works in a certain way. If I have an Object set to the variable of obj, and if I wanted to list all the keys in the object, I would say Object.keys(obj) Why wouldn't it be the following? obj.keys() If I was…
Greg
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Ruby block and unparenthesized arguments

I extracted simple example: require 'pp' x = 1..3 pp x.map do |i| {:value => i, :double => (i*2)} end pp x.map { |i| {:value => i, :double => (i*2)} } pp(x.map do |i| {:value => i, :double => (i*2)} end) pp(x.map { |i| {:value => i, :double =>…
rkj
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Time complexity for combination of parentheses

I tried to do the classical problem to implement an algorithm to print all valid combinations of n pairs of parentheses. I found this program (which works perfectly) : public static void addParen(ArrayList list, int leftRem, int rightRem,…
salamanka44
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C++ warning: suggest parentheses around arithmetic in operand of |

I have a code like A = B|C|D|E; Throwing the warning "suggest parentheses around arithmetic in operand of |" Expecting that expression needs high priority paranthesis for operators, tried the following ways: A=(B|C)|(D|E); one more as…
Programmer
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Automatically fix missing parenthesis in C

I converted some Fortran code to C. I was wondering if someone could help me solve the following problem: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] I know this warning is caused by syntax like this: A || B && C Which…
user2470258
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short circuiting and parenthesis

Does it matter how I group subexpressions when dealing with a single short-circuiting operator? a && b && c && d a && (b && (c && d)) (a && b) && (c && d) ((a && b) && c) && d Are the above expressions equivalent?
foobar
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