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
3
votes
2 answers
Infinite loop when using cmpq and je
I'm decrementing RAX on each iteration. If RAX is zero, the program should change flow.
# AT&T syntax
start_calc_factorial:
decq %rax
cmpq $0, %rax
je quit_calc_factorial
mulq %rcx
jmp start_calc_factorial
However, the program never…
Dutchman
- 180
- 7
3
votes
3 answers
How do I create a function which will return a dictionary with two functions in that will increment/decrement a count in Python?
I've been tasked with creating a function "make_counter" which takes a number as its only argument. It should return a dictionary containing two functions that can be invoked to increment and decrement the number and then return it.
The behaviour…
omega_geezy
- 31
- 1
3
votes
2 answers
Struggling with basic dataframe manipulation (Python)
I am a complete newbie at Python, and I'm struggling despite having Googled for quite a while. I know it should not be this difficult. I have a Dataframe called abc that looks like this:
PO_DATE PO_ITEM_NUMBER PO_PRICE …
Clare
- 49
- 5
3
votes
5 answers
How to decrement several variables in C++in a single line statement?
Edit: I replaced the phrase 'in one line' by 'in a single line statement' since this is what I was looking for
Let's say we have the following variables at hand:
int a = 5;
int b = 9;
Is there a way to compress this ...
a--;
b--;
... into in a…
Diggi55
- 174
- 8
3
votes
3 answers
Increment / decrement button In ExtJS
Is there a button in ExtJS with increment/decrement feature (something like that)? I have some numberfields with values that are usually incremented/decremented when edited and this button would be very helpful. Note that it is not critical for me…
Giku Promitt
- 610
- 1
- 5
- 19
3
votes
5 answers
Why is `x-- > 0` not undefined behaviour, while `x = x--` is?
As everyone knows, this loops through zero:
while (x-- > 0) { /* also known as x --> 0 */
printf("x = %d\n", x);
}
But x = x-- yields undefined behaviour.
Both examples need some 'return' value of x--, which is not there I guess. How can it be…
user142019
3
votes
2 answers
PHP decrement NULL value issue
I have noticed if a value is null i can increment it by one using ++$value but its not true about decrement , meaning --$value would return null , why?
$value = null;
echo ++$value; // 1
echo --$value; // null (I'm expecting -1)
alex
- 7,551
- 13
- 48
- 80
3
votes
1 answer
Does a change of value of a global variable by a function affect the order of addition?
I have tried the following code and got confused:
#include
int m=3;
int f(void)
{
m--;
return m;
}
int main()
{
m=f()+m; //as + operator is executed from left to right, it is okay that m=2+2
printf("%d\n", m); //m=4, as…
Preetom Saha Arko
- 2,588
- 4
- 21
- 37
3
votes
3 answers
Why is ++ and -- only used before and after variables?
I'm reading "The C programming language" by Brian W. Kernighan and Dennis M. Ritchie, on page 46 its states that "The increment and decrement operators can only be applied to variables; an expression like (i+j)++ is illegal". Why can't it be used…
Arlind Hajredinaj
- 8,380
- 3
- 30
- 45
3
votes
4 answers
Javascript for loop with iterator In the middle and decrement operator to the left of i?
For a non-recursive example of a factorial function I found this example and am having a little difficulty tracing through the code:
function fact(x) {
if(x == 0) {
return 1;
}
if(x < 0 ) {
return undefined;
}
for(var i…
phizzy
- 936
- 9
- 26
3
votes
2 answers
Find numbers in a string and decrement them
I have an HTML page that lists a long index of topics and page numbers. I want to find all the page numbers and their anchor tag links and decrement the page numbers by 1.
Here is an example line in the HTML:
breakeven volume (BEV),…
John Gayle
- 43
- 3
3
votes
1 answer
The history of 1- and 1+
I was in #lisp on freenode recently, and someone mentioned the existence of '1-' and 1+. Knowing about these functions left me wondering why they exist. Were they originally created for perormance reasons like the related -- and ++ of C/C++, or was…
Faheem Mitha
- 6,096
- 7
- 48
- 83
3
votes
1 answer
Simple increment/decrement counter
I would like to make a simple counter in PowerShell. It must prompt the user whether they'd like a higher or lower number.
The starting number must be 0, and it can't be lower than zero or higher than 10. If the user wants a higher number, it must…
ScriptingBerry
- 655
- 4
- 7
- 12
2
votes
2 answers
Is the behaviour of this statement of assignment and decrementation well defined?
The following statement does not really make sense:
value = value--;
I accidentially wrote this instead of just value-- or value = value-1 . But since it worked on my machine as intended, the error was not noticed.
Now I want to know, if this…
rkgghz
- 456
- 8
- 19
2
votes
2 answers
stopping counter at 0
I have two functions that increment and decrement number of items by 1, but when I decrement I want to stop at 0? this are the functions
const addToCart = (productId) => {
setCartItems((prev) => ({
...prev,
[productId]:…
Ondrej Dudas
- 23
- 3