Subtracting one from the value of a variable, generally with the use of an decrement operator.
Subtracting one from the value of a variable, generally with the use of an decrement operator(--).
Questions tagged [decrement]
425 questions
1043
votes
11 answers
Behaviour of increment and decrement operators in Python
How do I use pre-increment/decrement operators (++, --), just like in C++?
Why does ++count run, but not change the value of the variable?
Ashwin Nanjappa
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381
votes
10 answers
What does "!--" do in JavaScript?
I have this piece of code (taken from this question):
var walk = function(dir, done) {
var results = [];
fs.readdir(dir, function(err, list) {
if (err)
return done(err);
var pending = list.length;
if…
Kieran E
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147
votes
12 answers
The "++" and "--" operators have been deprecated Xcode 7.3
I am looking at Xcode 7.3 notes and I notice this issue.
The ++ and -- operators have been deprecated
Could some one explain why it is deprecated? And am I right that in new version of Xcode now you going to use instead of ++ this x +=…
Oleg Gordiichuk
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72
votes
5 answers
Decrementing for loops
I want to have a for loop like so:
for counter in range(10,0):
print counter,
and the output should be 10 9 8 7 6 5 4 3 2 1
pandoragami
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55
votes
7 answers
Decrement value in mysql but not negative
I want to decrement a value when user delete it in php and mysql. I want to check not to go below than 0. If value is 0 then do not decrement.
mysql_query("UPDATE table SET field = field - 1 WHERE id = $number");
If field is 0 then do not do…
user2244804
48
votes
1 answer
Why don't multiple decrement operators work in C when they work in C++?
Looking at this question and trying out some of the code:
int x = 100;
while ( 0 <-------------------- x )
{
printf("%d ", x);
}
I attempted to compile with gcc and got the following error:
file.c: In function 'main':
file:c:10:27: error:…
MD XF
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46
votes
5 answers
Decrement index in a loop after Swift C-style loops deprecated
How would you express a decrementing indexed loop in Swift 3.0, where the syntax below is not valid any more?
for var index = 10 ; index > 0; index-=1{
print(index)
}
// 10 9 8 7 6 5 4 3 2 1
netshark1000
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32
votes
1 answer
How do I increment or decrement a number in Common Lisp?
What is the idiomatic Common Lisp way to increment/decrement numbers and/or numeric variables?
Jabavu Adams
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29
votes
4 answers
Why do the INC and DEC instructions *not* affect the Carry Flag (CF)?
Why do the x86 instruction INC (increment) and DEC (decrement) not affect the CF (carry flag) in FLAGSREGISTER?
mohammad mahed
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28
votes
6 answers
Decrementing for loop in coffeescript
I know how to do a incrementing for loop in coffeescript such as:
Coffeescript:
for some in something
Generated Javascript:
for (_i = 0, _len = something.length; _i < _len; _i++)
How do I create a decrementing for loop similar to this in…
John
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27
votes
5 answers
Is it safe to put increment/decrement operators inside ternary/conditional operators?
Here's an example
#include
using namespace std;
int main()
{
int x = 0;
cout << (x == 0 ? x++ : x) << endl; //operator in branch
cout << "x=" << x << endl;
cout << (x == 1 || --x == 0 ? 1 : 2) << endl; //operator in…
jozxyqk
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26
votes
1 answer
What good is the NERFIN loop operation in LOLCODE?
What the spec says on the subject:
Iteration loops have the form:
IM IN YR
JB.
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17
votes
2 answers
MySQL Auto Increment Columns on TRANSACTION, COMMIT, and ROLLBACK
When using MySQL START TRANSACTION and the decision is made by MySQL to roll back -
In the case that a table had an AUTO_INCREMENT column - does the column get... decremented during the roll back?
Or should it?
I am having some issues where the…
user1502852
14
votes
2 answers
How can I define pre/post-increment behavior in Perl objects?
Date::Simple objects display this behavior, where $date++ returns the next day's date.
Date::Simple objects are immutable. After assigning $date1 to $date2, no change to $date1 can affect $date2. This means, for example, that there is nothing like…
Zaid
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13
votes
2 answers
Why does Knuth use this clunky decrement?
I'm looking at some of Prof. Don Knuth's code, written in CWEB that is converted to C. A specific example is dlx1.w, available from Knuth's website
At one stage, the .len value of a struct nd[cc] is decremented, and it is done in a clunky way:
…
Ed Wynn
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