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
5
votes
3 answers
What would cause a for loop to decrement when it's supposed to increment?
I wrote a method to calculate how long ago a father was twice as old as his son and in how many years from now this would be true. Unexpectedly, it returns "-2 years ago" for an 8-year-old father and a 3-year-old son. Equally unexpectedly, it…
K Man
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votes
0 answers
What is the purpose of forbidding increment or decrement operators by eslint
The eslint documentation describes a way to forbid the increment and decrement operators ++ and --.
The description includes the sentence, that these operators
are subject to automatic semicolon insertion, differences in whitespace can change…
Jankapunkt
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5
votes
4 answers
How can I increment and decrement an integer with the modulo operator
I am trying to increment an integer based on a click. How the click happens does not matter so I'll stick to the logic. I am doing this in Java but the logic should be the same all around.
int index = 0;
// then within the click event
//arrySize…
Lucas Santos
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5
votes
4 answers
When to use the Increment Operator on Strings in PHP?
I am learning PHP for the first time and I find it surprising that the language allows using the increment operator on strings.
$foo = 'xyZ';
print ++$foo; // prints xzA
The tutorials I can find around this topic introduce toy examples…
Helmyano
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4 answers
Atypical uses for Javascript's ++ and -- operators
If I recall correctly from Crockford's "Javascript: The Good Parts", he is not in favor of using the ++ or -- operators, but I also tend to recall he doesn't provide an especially strong argument against them.
Below is a use of these operators that…
Dexygen
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4
votes
3 answers
Is decrement of bool variable defined in С?
This question is about С. Say we have a code like this:
bool a = false;
a++;
printf("%d\n", a);
a--;
printf("%d\n", a);
This on my x86-64 linux machine shows:
1
0
That was not a surprise for me. And this code:
bool a = false;
a++;…
alex_why
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4
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2 answers
Looping Fundamentals
Can someone please let me know where I went wrong here? When I run the code, I get 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 10. How would I make the loop stop at 0? When I remove the last line of code (console.log(countDown);), the loop ends at 0 but the…
junebug
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4
votes
3 answers
post decrement in while conditon in C
I've done a search and I’ve found nothing relevant to my query.
I am currently debugging a C optimizer and the code in question looks like this:
while( x-- )
array[x] = NULL;
What should happen in this instance? And should the result of this logic…
Ahmad Badoura
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4
votes
2 answers
pre Decrement vs. post Decrement
When should I use pre decrement and when to use post decrement?
and for the following code snippet, should I use pre or post decrement.
static private void function(int number)
{
charArr = new char[number];
int i = 0;
int tempCounter;
…
sikas
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4
votes
5 answers
Decrementing lowercase letters to lowercase letters only
I want to decrement lowercase letters to lowercase letters only. I do this by taking the ASCII value of the character and decrement it. But for example if I decrement a by 2, the answer should be y. Not a symbol or a uppercase letter.
int charValue…
manuka_m
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4
votes
1 answer
Understanding Java behaviour in recursive factorial
I created two recursive methods to calculate factorial as follows:
private int fact1(int n) {
if (n == 0 || n == 1)
return 1;
return n * fact1(--n);
}
private int fact2(int n) {
if (n == 0 || n == 1)
return 1;
…
El Mestre
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4
votes
2 answers
Recursion and pre-decrement operator
I have this function:
void m(int n)
{
if(n > 0)
m(--n);
cout << n << " "; //for n = 5 --> output is: 0 0 1 2 3 4
}
I have a problem with understanding how it works.
For example:
n(input) = 5
output: 0 0 1 2 3 4
My question is: Why…
gryzek
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4
votes
2 answers
Decrementing a value and wrapping back to a max value without using if statement?
Incrementing and wrapping back to zero is easy:
i = (i + 1) % Max;
But decrementing is not as straight forward. Basically to decrement and wrap you usually find code like this:
i--;
if (i < 0)
i = Max;
How can we write the previous code without…
vexe
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4
votes
1 answer
Mixing post- and pre- increment/decrement operators on the same variable
Possible Duplicate:
Why is ++i considered an l-value, but i++ is not?
In C++ (and also in C), if I write:
++x--
++(x--)
i get the error: lvalue required as increment operand
However (++x)-- compiles. I am confused.
Xolve
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4
votes
5 answers
How do you subtract from a negative integer but add to a positive?
Simple question really, although I'm not sure if there's an answer.
I am handling an integer which can be positive or negative.
However, I would like to either increment or decrement it dependant on the sign.
For example, if it's "2", then add 1 and…
Shivam Malhotra
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